GMS87C2020 datasheet(11/92 Pages) HYNIX

Part #	GMS87C2020

Description	CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

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Manufacturer	HYNIX [Hynix Semiconductor]

Direct Link	http://www.skhynix.com/kor/main.do

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Hyundai Micro Electronics

GMS81C2020/GMS81C2120

Nov. 1999 Ver 0.0

preliminary

11

7. PIN DESCRIPTIONS (GMS81C2020)

VDD: Supply voltage.

VSS: Circuit ground.

AVDD: 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.

AVSS: ADC circuit ground.

RESETB: Reset the MCU.

XI: Input to the inverting oscillator amplifier and input to

the internal clock operating circuit.

XO: Output from the inverting oscillator amplifier.

SXI: Input to the internal subsystem clock operating cir-

cuit. In addition, SXI serves the R74 pin when selected by

the code option.

SXO: Output from the inverting subsystem oscillator am-

plifier. In addition, SXO serves the R75 pin when selected

by the code option.

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

In addition, RA serves the functions of the Vdisp special

features. Vdisp 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 an 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 an 8-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 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, R7 is shared with the

ADC input.

Port pin

Alternate function

RA

Vdisp (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)

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