GMS81C2012/GMS81C2020
5. PIN FUNCTION
HYUNDAI MicroElectronics
VDD: Supply voltage.
VSS: Circuit ground.
tions of the following special features.
Port pin
Alternate function
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.
R40
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.
AVSS: ADC circuit ground.
RESET: Reset the MCU.
XIN: Input to the inverting oscillator amplifier and input to
the internal clock operating circuit.
Port pin
Alternate function
SCLK (Serial clock)
R53
R54
R55
R56
XOUT: Output from the inverting oscillator amplifier.
SIN (Serial data input)
SOUT (Serial data output)
PWM1O (PWM1 Output)
T1O (Timer/Counter 1 output)
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.
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
Alternate function
V
disp (High-voltage input power supply)
RA
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
Alternate function
AN0 (Analog Input 0)
R60
R61
R62
R63
R64
R66
R66
R67
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
R00
R01
R02
R03
INT0 (External interrupt 0)
INT1 (External interrupt 1)
EC0 (Event counter input)
BUZO (Buzzer driver output)
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.
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.
Port pin
Alternate function
AN8 (Analog Input 8)
AN9 (Analog Input 9)
AN10 (Analog Input 10)
AN11 (Analog Input 11)
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.
R70
R71
R72
R73
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.
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.
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-
SXOUT: Output from the inverting subsystem oscillator
amplifier. In addition, SXOUT serves the R75 pin when
12
MAR. 2000 Ver 1.00
HYNIX [ HYNIX SEMICONDUCTOR ]
