GMS81C2112/GMS81C2120
5. PIN FUNCTION
V
DD
: Supply voltage.
V
SS
: Circuit ground.
AV
DD
: 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.
AV
SS
: ADC circuit ground.
RESET:
Reset the MCU.
X
IN
: Input to the inverting oscillator amplifier and input to
the internal clock operating circuit.
X
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.
Port pin
RA
Alternate function
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~R34:
R3 is a 5-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.
R53~R57:
R5 is an 5-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)
V
disp
(High-voltage input power supply)
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
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)
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)
8
JUNE. 2001 Ver 1.00
HYNIX [ HYNIX SEMICONDUCTOR ]
