GMS81C2012 Datasheet, PDF(12/107 Page) Hynix Semiconductor – HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS81C2012 Datasheet, PDF (12/107 Pages) Hynix Semiconductor – HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS81C2012/GMS81C2020

HYUNDAI MicroElectronics

5. PIN FUNCTION

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.

RESET: Reset the MCU.

XIN: Input to the inverting oscillator amplifier and input to

the internal clock operating circuit.

XOUT: Output from the inverting oscillator amplifier.

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.

Port pin

Alternate function

Vdisp (High-voltage input power supply)

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.

Port pin

R00

R01

R02

R03

Alternate function

INT0 (External interrupt 0)

INT1 (External interrupt 1)

EC0 (Event counter input)

BUZO (Buzzer driver output)

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.

Port pin

R40

Alternate function

T0O (Timer/Counter 0 output)

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.

Port pin

R53

R54

R55

R56

Alternate function

SCLK (Serial clock)

SIN (Serial data input)

SOUT (Serial data output)

PWM1O (PWM1 Output)

T1O (Timer/Counter 1 output)

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.

Port pin

R60

R61

R62

R63

R64

R66

R67

Alternate function

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)

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.

Port pin

R70

R71

R72

R73

Alternate function

AN8 (Analog Input 8)

AN9 (Analog Input 9)

AN10 (Analog Input 10)

AN11 (Analog Input 11)

SXIN: 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.

SXOUT: Output from the inverting subsystem oscillator

amplifier. In addition, SXOUT serves the R75 pin when

MAR. 2000 Ver 1.00

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