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1995 Jun 30

Philips Semiconductors

Product speciﬁcation

Microcontrollers for universal infrared

remote transmitter applications

PCA84C922; PCA84C923

CONTENTS

FEATURES

GENERAL DESCRIPTION

ORDERING INFORMATION

BLOCK DIAGRAMS

PINNING INFORMATION

5.1

Pinning

5.2

Pin description

GENERAL OPERATION DESCRIPTION

6.1

System selection

6.2

Key scanning

6.3

Accessing command code

HARDWARE MODULATOR

7.1

ON-time Register

7.2

OFF-time Register

7.3

Pulse Timer

7.4

Pulse Counter

7.5

Hardware Modulator Control Register

(HMCTL)

7.6

Operation of the Hardware Modulator

CODING TABLE

8.1

Accessing the Coding Table

WATCHDOG TIMER (WDT)

PORT OPTIONS

INTERRUPTS

11.1

External keypad wake-up and T0/INT pin

interrupt

11.2

Hardware Modulator interrupt

11.3

Internal Timer/counter (T1) interrupt

DERIVATIVE REGISTERS

EMULATION

LIMITING VALUES

DC CHARACTERISTICS

AC CHARACTERISTICS

PACKAGE OUTLINES

SOLDERING

18.1

Introduction

18.2

SDIP

18.3

SO and VSO

DEFINITIONS

LIFE SUPPORT APPLICATIONS

1995 Jun 30

Philips Semiconductors

Product speciﬁcation

Microcontrollers for universal infrared

remote transmitter applications

PCA84C922; PCA84C923

FEATURES

•

84CXXX CPU

•

ROM, RAM, I/O and keypad configurations are device

dependent; see Table 1

•

Two test inputs: T0 and T1

•

3 single-level vectored interrupt sources:

– external (T0/INT and Port 1, for keypad press

Wake-up function)

– Timer/counter (TI)

– Hardware Modulator interrupt

•

8-bit programmable timer/counter with 5-bit prescaler

•

Power saving Idle and Stop modes

•

Low power operation: 2 V

•

Hardware Modulator

•

Watchdog timer

•

On-chip oscillator: 1 to 6 MHz

•

Single supply voltage: 2.0 to 5.5 V

•

Operating temperature:

−

20 to +70

•

Available packages: SO24, SO28, VSO56 and SDIP24.

GENERAL DESCRIPTION

The PCA84C922A, PCA84C922C, PCA84C923A,

PCA84C923C and PCA84C923D are members of the

PCF84CXXXA CMOS family of microcontrollers and have

been designed for use in universal infrared remote

commander applications. The term PCA84C92X is used

throughout this data sheet to refer to all devices in the

range, differences between devices are shown in Table 1

and also highlighted in the text. In addition to the common

functions of the PCF84CXXXA family of microcontrollers

the PCA84C92X also provides:

•

a Hardware Modulator that generates programmable

pulse trains for driving an infrared LED

•

an on-chip Coding Table specifically for the storage of

code data

•

a modified interrupt architecture that will wake-up the

CPU from the Idle or Stop modes when any key is

pressed

•

a Watchdog Timer to prevent CPU lock-up.

The PCA84C923D has been designed as the emulation

chip for both the PCA84C92X and the PCA84CX22 range

of microcontrollers (both ranges being pin compatible).

Table 1

The PCA84C92X range of microcontrollers

ORDERING INFORMATION

FUNCTION

PCA84C923D

PCA84C923C

PCA84C923A

PCA84C922C

PCA84C922A

System ROM

8 kbytes

System RAM

256 bytes

128 bytes

Coding Table ROM

16 kbytes

8 kbytes

Coding Table extension

up to 64 kbytes no

Maximum number of keys 189

117

I/O

Emulation device

PCA84C923D

PCA84C923D PCA84C923D

Package

VSO56

SO28

SO24 and SDIP24

SO28

SO24 and SDIP24

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCA84C922AP

SDIP24

plastic shrink dual in-line package; 24 leads (400 mil)

SOT234-1

PCA84C922AT

SO24

plastic small outline package; 24 leads; body width 7.5 mm

SOT137-1

PCA84C922CT

SO28

plastic small outline package; 28 leads; body width 7.5 mm

SOT136-1

PCA84C923AP

SDIP24

plastic shrink dual in-line package; 24 leads (400 mil)

SOT234-1

PCA84C923AT

SO24

plastic small outline package; 24 leads; body width 7.5 mm

SOT137-1

PCA84C923CT

SO28

plastic small outline package; 28 leads; body width 7.5 mm

SOT136-1

PCA84C923DT

VSO56

plastic very small outline package; 56 leads

SOT190-1

1995 Jun 30

Philips Semiconductors

Product speciﬁcation

Microcontrollers for universal infrared

remote transmitter applications

PCA84C922; PCA84C923

BLOCK DIAGRAMS

handbook, full pagewidth

MBE347

84CXX CORE

PORT 0

metal option

INTO

T0/INT

P10

P12

P14

P16

P11

P13

P15

P17

P07 to P00

ROM

16 kbytes

CODING TABLE

DP65

DP60

address

(LSB)

DPORT 5

LATCH

CODING TABLE

CONTROL

DPORT 6

LATCH

DP67 to DP65

address (MSB)

WATCHDOG

TIMER

ROM

8 kbytes

RAM

256 bytes

OSCILLATOR

HARDWARE

MODULATOR

DXALE, DXWR, DXRD

DAO to DA7

XTAL1

XTAL2

HMINT

OUTPUT

DRIVER

LOUT

ILOUT

RDD5

RSTO

RESET

DP67

DP60

P23

P20

EMU

DP57

DP50

Fig.1 Block diagram - PCA84C923D.

1995 Jun 30

Philips Semiconductors

Product speciﬁcation

Microcontrollers for universal infrared

remote transmitter applications

PCA84C922; PCA84C923

PINNING INFORMATION

5.1

Pinning

Fig.4 Pin configuration of PCA84C923D (VSO56).

handbook, halfpage

PCA84C923D

MBE343

RSTO

P22

P14

P01

P00

n.c.

DP56

T0/INT

DP55

RESET

DP54

DP57

DP53

DP52

XTAL2

n.c.

P04

DP51

P05

DP50

P16

P20

DP60

XTAL1

P23

P15

DP67

EMU

P03

n.c.

LOUT

DP66

P10

DP65

P02

DP64

P11

DP63

P12

n.c.

P07

P06

DP62

P17

DP61

INTO

P21

P13

Fig.5

Pin configuration of PCA84C922C

(SO28) and PCA84C923C (SO28).

handbook, halfpage

PCA84C922C

PCA84C923C

MBE342

P22

P14

P01

P00

RESET

XTAL2

XTAL1

P04

P05

P16

P20

T0/INT

P23

P15

P02

P03

P10

P11

P12

P13

P07

P06

P17

P21

LOUT

Fig.6

Pin configuration of PCA84C922A

(SO24/SDIP24) and PCA84C923A

(SO24/SDIP24).

handbook, halfpage

PCA84C922A

PCA84C923A

MBE341

P14

P01

P00

T0/INT

RESET

XTAL2

XTAL1

P04

P05

P16

P15

P02

P03

LOUT

P10

P11

P12

P13

P07

P06

P17

1995 Jun 30

Philips Semiconductors

Product speciﬁcation

Microcontrollers for universal infrared

remote transmitter applications

PCA84C922; PCA84C923

5.2

Pin description

Table 2

PCA84C923D (VS056)

SYMBOL

PIN

DESCRIPTION

P00 to P07

7, 6, 52, 51, 22,

24, 34 and 35

Standard I/O Port lines, generally used for keypad scanning or for LSB address

lines of coding table.

P10

Port line 10 or emulation DXWR signal input.

P11

Port line 11 or emulation DXRD signal input.

P12

Port line 12 or emulation DXALE signal input.

P13

Port line 13 or emulation EXDI signal input.

P14 to P17

4, 55, 26 and 32

Standard I/O port lines, generally used for keypad sensing, the wake-up function

can be removed by mask option.

P20 to P23

27, 29, 3 and 56

Standard I/O port lines with 10 mA sink capability.

DP50 to DP57

25, 23, 17, 15, 14,

12, 9 and 5

Standard I/O port lines, generally used for the data bus of Coding Table.

DP60 to DP67

28, 31, 33, 40, 42,

43, 45 and 54

Standard I/O Port lines, generally used for keypad scanning or for MSB address

lines of Coding Table.

RSTO

Used for emulation purposes only. This output is the result of the OR operation

carried out internally on the RESET input and the Watchdog Timer reset and is

connected to the RESET pin of the 84C00.

T0/INT

Test pin T0 or external interrupt input.

Test pin T1 or timer/counter input (T1).

RESET

Active HIGH reset pin; normally connected to V

as Power-on-reset serves the

same function.

XTAL2

Crystal or ceramic resonator or LC oscillator connections.

XTAL1

INTO

Used for emulation purposes only and is connected to the T0/INT pin of the

84C00.

LOUT

Pulse train output pin, capable of sinking 30 mA.

EMU

Emulation mode control pin; for normal operation this pin is connected to V

Power supply.

2 and 46

Ground.

1995 Jun 30

Philips Semiconductors

Product speciﬁcation

Microcontrollers for universal infrared

remote transmitter applications

PCA84C922; PCA84C923

Table 3

PCA84C922C (SO28) and PCA84C923C (SO28)

Table 4

PCA84C922A (SO24/SDIP24) and PCA84C923A (SO24/SDIP24)

SYMBOL

PIN

DESCRIPTION

P00 to P07

4, 3, 26, 25,

11, 12, 17, 18

Standard I/O port lines, generally used for keypad scanning or for LSB address byte of

code data.

P10 to P17

22, 21, 20, 19,

2, 27, 13, 16

Standard I/O port lines, generally used for keypad sensing, the wake-up function of

P14 to P17 can be removed by mask option.

P20 to P23

14, 15, 1, 28

Standard I/O port lines with 10 mA sink capability.

T0/INT

Test pin T0 or external interrupt input.

Test pin T1 or timer/counter input (T1).

RESET

Active HIGH reset pin; normally connected to V

as Power-on-reset serves the same

function.

XTAL2

Crystal or ceramic resonator or LC oscillator connections.

XTAL1

LOUT

Pulse train output pin, capable of sinking 30 mA.

Power supply.

Ground.

SYMBOL

PIN

DESCRIPTION

P00 to P07

3, 2, 23, 22,

10, 11, 14, 15

Standard I/O port lines, generally used for keypad scanning or for LSB address byte of

code data.

P10 to P17

19,18, 17, 16,

1, 24,12,13

Standard I/O port lines, generally used for keypad sensing, the wake-up function of

P14 to P17 can be removed by mask option.

T0/INT

Test pin T0 or external interrupt input.

Test pin T1 or timer/counter input (T1).

RESET

Active HIGH reset pin; normally connected to V

as Power-on-reset serves the same

function.

XTAL2

Crystal or ceramic resonator or LC oscillator connections.

XTAL1

LOUT

Pulse train output pin, capable of sinking 30 mA.

Power supply.

Ground.

1995 Jun 30

Philips Semiconductors

Product speciﬁcation

Microcontrollers for universal infrared

remote transmitter applications

PCA84C922; PCA84C923

GENERAL OPERATION DESCRIPTION

The main application for the PCA84C92X is as a universal

infrared remote control commander and in this role the

PCA84C92X offers the complete solution in one chip.

The PCA84C92X can be programmed to generate code

data that conforms to any protocol (Philips, NEC, RCA,

Thomson and Siemens etc.) and is suitable for use in the

remote control of TVs, VCRs, audio equipment,

air-conditioning systems and in many other applications.

The ability of the PCA84C923D to access external

memory and therefore support more protocols, makes it an

extremely versatile device.

6.1

System selection

Different systems (TV or VCR etc) can be controlled using

one universal infrared remote control commander;

switches can be used to select a specific system.

However, the PCA84C92X provides pin T1 for system

selection purposes and software is used to detect the

specific system. Port lines P14 to P17 can also be used for

system selection if their wake-up functions have not been

selected as a mask option.

When no key is pressed the scan lines (Port 0) can be

programmed HIGH and the sense lines (Port 1)

programmed LOW. If a diode is connected between a

sense line and scan line then the scan line will be pulled

LOW and this can be detected by a read operation to

Port 0.

6.2

Key scanning

Port lines P10 to P17 and T0/INT have been designed to

be used as key sense lines. However, if the wake-up

option is not selected for ports P14 to P17 then these can

be used as general I/O lines.

Port lines P00 to P07, P20 to P23 and DP60 to DP67 can

be used as key scan lines or general I/O ports. Derivative

Port 6 also provides the High byte address for the Coding

Table, even when used as scan lines.

After a Power-on-reset, the scan lines are set LOW and

the sense lines HIGH. If the system has entered the Stop

mode (by software) then when any key is depressed an

external interrupt will be generated and the system will be

woken-up.

If the external interrupt was enabled (by using the ‘EN I’

instruction) before the Stop mode was entered, then when

the CPU is woken-up, the instruction that follows the STOP

instruction will be executed before diverting to the interrupt

routine at vector address 03H. However, if the interrupt

was not enabled before the Stop mode was entered, then

when the CPU is woken-up the instruction that follows the

STOP instruction will be executed.

6.3

Accessing command code

When any key is depressed its function and operation

protocol are determined, then the command code is read.

If the command code is stored in system ROM it can be

accessed using the ‘MOVP A,@A’ instruction. If the

command code resides in Coding Table ROM it can be

accessed by writing the address to DP60 to DP67 (High

byte) and P00 to P07 (Low byte) and then reading the data

from DP50 to DP57.

In Normal mode, if the Coding Table address is within the

0000 to 1FFFH range for PCA84C922 devices, or within

the 0000 to 3FFFH range for PCA84C923 devices, then

the internal Coding Table will be accessed when

Derivative Port 5 (address 05H) is read.

In the Normal mode only the PCA84C923D has the ability

to access external memory. If the Coding Table address is

greater than 3FFFH then the external memory will be

accessed when Derivative Port 5 (terminal) is read.

When the PCA84C923D is used in the Emulation mode,

when Derivative Port 5 is read, data will always be read

from DP50 to DP57 terminals. Therefore, the internal

Coding Table ROM can be emulated when the

PCA84C923D and the bond-out chip PCF84C00 are used.

1995 Jun 30

Philips Semiconductors

Product speciﬁcation

Microcontrollers for universal infrared

remote transmitter applications

PCA84C922; PCA84C923

HARDWARE MODULATOR

The Hardware Modulator used in the PCA84C92X is the

same as the Hardware modulator used in the PCA84CX22

range of microcontrollers.

The function of the Hardware Modulator is to generate a

coded pulse train which is subsequently converted into an

infrared signal by an IR-LED. It is this coded IR signal that

controls the remote equipment. The number of pulses in

the pulse train, the time between pulse train bursts and the

duty cycle of a pulse are all programmable. A typical pulse

train is shown in Fig.10.

The block diagram of the Hardware Modulator is shown in

Fig.14 and comprises:

•

An 8-bit ON-time Register

•

An 8-bit OFF-time Register

•

An 8-bit Control Register

•

A Pulse Timer

•