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Table of Contents

1. OVERVIEW ...........................................1

Description ......................................................... 1

Features .............................................................1

Development Tools ............................................2

Ordering Information ..........................................2

2. BLOCK DIAGRAM ................................3

3. PIN ASSIGNMENT ...............................4

4. PACKAGE DIAGRAM

.............................. 6

5. PIN FUNCTION .....................................8

6. PORT STRUCTURES .........................11

7. ELECTRICAL CHARACTERISTICS ... 14

Absolute Maximum Ratings ............................. 14

Recommended Operating Conditions.............. 14

A/D Converter Characteristics ......................... 14

DC Electrical Characteristics for Standard Pins(5V)

..........................................................................15

DC Electrical Characteristics for High-Voltage Pins

..........................................................................16

AC Characteristics ...........................................17

AC Characteristics ...........................................18

Typical Characteristics .....................................19

8. MEMORY ORGANIZATION................ 21

Registers .......................................................... 21

Program Memory ............................................. 24

Data Memory ...................................................27

Addressing Mode .............................................31

9. I/O PORTS ..........................................35

10. BASIC INTERVAL TIMER .................39

11. WATCHDOG TIMER......................... 41

12. TIMER/EVENT COUNTER ............... 44

8-bit Timer / Counter Mode .............................. 46

16-bit Timer / Counter Mode ............................50

8-bit Compare Output (16-bit) ..........................51

8-bit Capture Mode ..........................................51

16-bit Capture Mode ........................................54

PWM Mode ......................................................55

13. ANALOG DIGITAL CONVERTER ....58

14. SERIAL PERIPHERAL INTERFACE 61

Transmission/Receiving Timing ...................... 63

The method of Serial I/O ................................. 64

The Method to Test Correct Transmission ...... 64

15. BUZZER FUNCTION ........................65

16. INTERRUPTS ...................................67

Interrupt Sequence .......................................... 69

Multi Interrupt .................................................. 71

External Interrupt ............................................. 72

17. Power Saving Mode.......................... 74

Operating Mode .............................................. 75

Stop Mode ....................................................... 76

Wake-up Timer Mode ...................................... 77

Internal RC-Oscillated Watchdog Timer Mode 78

Minimizing Current Consumption .................... 79

18. OSCILLATOR CIRCUIT ....................81

19. RESET .............................................. 82

External Reset Input ........................................ 82

Watchdog Timer Reset ................................... 82

20. POWER FAIL PROCESSOR ............83

21. OTP PROGRAMMING...................... 85

DEVICE CONFIGURATION AREA ...................... 85

A. CONTROL REGISTER LIST ................. i

B. INSTRUCTION .................................... iii

Terminology List................................................ iii

Instruction Map ..................................................iv

Instruction Set .................................................... v

C.MASK ORDER SHEET ........................ xi

HYUNDAI MicroElectronics

GMS81C2012/GMS81C2020

MAR. 2000 Ver 1.00

GMS81C2012/GMS81C2020

CMOS Single-Chip 8-Bit Microcontroller

with A/D Converter & VFD Driver

1. OVERVIEW

1.1 Description

The GMS81C2012 and GMS81C2020 are advanced CMOS 8-bit microcontroller with 12K/20K bytes of ROM. These are a

powerful microcontroller which provides a highly flexible and cost effective solution to many VFD applications. These pro-

vide the following standard features: 12K/20K bytes of ROM, 448 bytes of RAM, 8-bit timer/counter, 8-bit A/D converter,

10-bit High Speed PWM Output, Programmable Buzzer Driving Port, 8-bit Basic Interval Timer, 7-bit Watch dog Timer,

Serial Peripheral Interface, on-chip oscillator and clock circuitry. They also come with high voltage I/O pins that can directly

drive a VFD (Vacuum Fluorescent Display). In addition, the GMS81C2012 and GMS81C2020 support power saving modes

to reduce power consumption.

1.2 Features

• 20K/12K bytes ROM(EPROM)

• 448 Bytes of On-Chip Data RAM

(Including STACK Area)

• Minimum Instruction Execution time:

- 1uS at 4MHz (2cycle NOP Instruction)

• One 8-bit Basic Interval Timer

• One 7-bit Watch Dog Timer

• Two 8-bit Timer/Counters

• 10-bit High Speed PWM Output

• One 8-bit Serial Peripheral Interface

• Two External Interrupt Ports

• One Programmable 6-bit Buzzer Driving Port

• 60 I/O Lines

- 56 Programmable I/O pins

(Included 30 high-voltage pins Max. 40V)

- Three Input Only pins: 1 high-voltage pin

- One Output Only pin

• Eight Interrupt Sources

- Two External Sources (INT0, INT1)

- Two Timer/Counter Sources (Timer0, Timer1)

- Four Functional Sources (SPI,ADC,WDT,BIT)

• 12-Channel 8-bit On-Chip Analog to Digital

Converter

• Oscillator:

- Crystal

- Ceramic Resonator

- External R Oscillator

• Low Power Dissipation Modes

- STOP mode

- Wake-up Timer Mode

- Standby Mode

- Watch Mode

- Sub-active Mode

• Operating Voltage: 2.7V ~ 5.5V (at 4.5MHz)

• Operating Frequency: 1MHz ~ 4.5MHz

• Sub-clock: 32.768KHz Crystal Oscillator

• Enhanced EMS Improvement

Power Fail Processor

(Noise Immunity Circuit)

Device name

ROM Size

RAM Size

OTP

Package

GMS81C2012

12K bytes

448 bytes

64SDIP, 64MQFP,

64LQFP

GMS81C2020

20K bytes

GMS87C2020

GMS81C2012/GMS81C2020

HYUNDAI MicroElectronics

MAR. 2000 Ver 1.00

1.3 Development Tools

The GMS81C20xx are supported by a full-featured macro

assembler, an in-circuit emulator CHOICE-Jr.

and OTP

programmers. There are third different type programmers

such as emulator add-on board type, single type, gang type.

For mode detail, Refer to “21. OTP PROGRAMMING” on

page 89. Macro assembler operates under the MS-Win-

dows 95/98

Please contact sales part of Hyundai MicroElectronics.

1.4 Ordering Information

In Circuit

Emulators

CHOICE-Dr.

Socket Adapter

for OTP

CHPOD81C20D-64SD (64SDIP)

CHPOD81C20D-64QFP (64MQFP)

CHPOD81C20D-64LQFP (64LQFP)

Assembler

HME Macro Assembler

Device name

ROM Size

RAM size

Package

Mask version

GMS81C2012 K

GMS81C2012 Q

GMS81C2012 LQ

GMS81C2020 K

GMS81C2020 Q

GMS81C2020 LQ

12K bytes

20K bytes

448 bytes

64SDIP

64MQFP

64LQFP

64SDIP

64MQFP

64LQFP

OTP version

GMS87C2020 K

GMS87C2020 Q

GMS87C2020 LQ

20K bytes OTP

448 bytes

64SDIP

64MQFP

64LQFP

HYUNDAI MicroElectronics

GMS81C2012/GMS81C2020

MAR. 2000 Ver 1.00

2. BLOCK DIAGRAM

ALU

Interrupt Controller

Data Memory

8-bit

ADC

8-bit

Counter

Timer/

Program

Memory

Data Table

8-b it B a sic

Tim er

In terval

Watchdog

Timer

PSW

S yste m co n tro lle r

T im in g g e ne ra to r

S yste m

C lock C o n tro lle r

C lo ck

G en e ra to r

RESET

R40 / T0O

R41

R50

R20~R27

Power

Supply

8-bit serial

R51

R52

R53 / SCLK

R54 / SIN

R55 / SOUT

R56 / PWM1O/T1O

R57

R10~R17

R30~R35

Interface

Buzzer

Driver

R60 / AN0

R61 / AN1

R62 / AN2

R63 / AN3

R64 / AN4

R65 / AN5

R66 / AN6

R67 / AN7

(448 bytes)

10-bit

ADC Power

Supply

Stack Pointer

R04

R03/BUZO

R02/EC0

R00/INT0

Vdisp/RA

R70 / AN8

R71 / AN9

R72 / AN10

R42

R43

R73 / AN11

S u b S yste m

C lock C o n tro lle r

R05

R06

R07

R01/INT1

PWM

High Voltage Port

GMS81C2012/GMS81C2020

HYUNDAI MicroElectronics

MAR. 2000 Ver 1.00

3. PIN ASSIGNMENT

R40

R42

R43

R50

R51

R52

R53

R54

R55

R56

R57

RESET

SCLK

SIN

SOUT

PWM1O/T1O

SXIN

SXOUT

AN0

R74

R75

R60

R61

R62

R63

R64

R65

R66

R67

R70

R71

R72

R73

AN1

AN2

AN3

AN4

AN5

AN6

AN7

AN8

AN9

AN10

AN11

R35

R34

R33

R32

R31

R30

R27

R26

R25

R24

R23

R22

R21

R20

R17

R16

R15

R14

R13

R12

R11

R10

R07

R06

R05

R04

R03

R02

R01

R00

R51

R30

R31

R32

R33

R34

R35

R40

R41

R42

R43

R50

T0O

disp

R66

R04

R03

R02

R01

R00

R73

R72

R71

R70

R67

AN6

AN8

AN7

RESET

PWM

SXI

SXO

SCL

64MQFP

64SDIP

BUZO

EC0

INT1

INT0

disp

R41

T0O

AN9

AN11

AN10

INT0

EC0

INT1

BUZO

High Voltage Port

12/

GMS81C2012/20

HYUNDAI MicroElectronics

GMS81C2012/GMS81C2020

MAR. 2000 Ver 1.00

R06

R05

R04

R03

R02

R01

R00

R73

R72

R71

R70

R67

R66

R65

RESE

R27

R30

R31

R32

R33

R34

R35

R40

R41

R42

R43

R50

R51

R52

R53

64LQFP

PWM

SXI

SXO

AN0

AN1

AN2

AN3

AN4

AN6

AN8

AN7

AN5

disp

T0O

SCLK

AN10

AN11

AN9

INT1

BUZO

EC0

INT0

High Voltage Port

GMS81C2012/20

GMS81C2012/GMS81C2020

HYUNDAI MicroElectronics

MAR. 2000 Ver 1.00

5. PIN FUNCTION

: Supply voltage.

: Circuit ground.

: Supply voltage to the ladder resistor of ADC cir-

cuit. To enhance the resolution of analog to digital convert-

er, use independent power source as well as possible, other

than digital power source.

: ADC circuit ground.

RESET: Reset the MCU.

: Input to the inverting oscillator amplifier and input to

the internal clock operating circuit.

OUT

: Output from the inverting oscillator amplifier.

RA(V

disp

): RA is one-bit high-voltage input only port pin.

In addition, RA serves the functions of the V

disp

special

features. V

disp

is used as a high-voltage input power supply

pin when selected by the mask option.

R00~R07: R0 is an 8-bit high-voltage CMOS bidirectional

I/O port. R0 pins 1 or 0 written to the Port Direction Reg-

ister can be used as outputs or inputs. In addition, R0

serves the functions of the various following special fea-

tures.

R10~R17: R1 is an 8-bit high-voltage CMOS bidirectional

I/O port. R1 pins 1 or 0 written to the Port Direction Reg-

ister can be used as outputs or inputs.

R20~R27: R2 is an 8-bit high-voltage CMOS bidirectional

I/O port. R2 pins 1 or 0 written to the Port Direction Reg-

ister can be used as outputs or inputs.

R30~R35: R3 is a 6-bit high-voltage CMOS bidirectional

I/O port. R3 pins 1 or 0 written to the Port Direction Reg-

ister can be used as outputs or inputs.

R40~R43: R4 is a 4-bit CMOS bidirectional I/O port. R4

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs. In addition, R4 serves the func-

tions of the following special features.

R50~R57: R5 is an 8-bit CMOS bidirectional I/O port. R5

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs. In addition, R5 serves the func-

tions of the various following special features.

R60~R67: R6 is an 8-bit CMOS bidirectional I/O port. R6

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs. In addition, R6 is shared with the

ADC input.

R70~R73: R7 is a 4-bit CMOS bidirectional I/O port. R6

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs. In addition, R7 is shared with the

ADC input.

: Input to the internal subsystem clock operating cir-

cuit. In addition, SXIN serves the R74 pin when selected

by the code option. *R74 has a Pull-up circuit.

OUT

: Output from the inverting subsystem oscillator

amplifier. In addition, SXOUT serves the R75 pin when

Port pin

Alternate function

disp

(High-voltage input power supply)

Port pin

Alternate function

R00

R01

R02

R03

INT0 (External interrupt 0)

INT1 (External interrupt 1)

EC0 (Event counter input)

BUZO (Buzzer driver output)

Port pin

Alternate function

R40

T0O (Timer/Counter 0 output)

Port pin

Alternate function

R53

R54

R55

R56

SCLK (Serial clock)

SIN (Serial data input)

SOUT (Serial data output)

PWM1O (PWM1 Output)

T1O (Timer/Counter 1 output)

Port pin

Alternate function

R60

R61

R62

R63

R64

R66

R67

AN0 (Analog Input 0)

AN1 (Analog Input 1)

AN2 (Analog Input 2)

AN3 (Analog Input 3)

AN4 (Analog Input 4)

AN5 (Analog Input 5)

AN6 (Analog Input 6)

AN7 (Analog Input 7)

Port pin

Alternate function

R70

R71

R72

R73

AN8 (Analog Input 8)

AN9 (Analog Input 9)

AN10 (Analog Input 10)

AN11 (Analog Input 11)