Hyundai Micro Electronics
GMS81C2020/GMS81C2120
8. PIN DESCRIPTIONS (GMS81C2120)
VDD
: Supply voltage.
: Circuit ground.
tions of the various following special features.
VSS
Port pin
Alternate function
SCLK (Serial clock)
AVDD
: Supply voltage to the ladder resistor of ADC cir-
R53
R54
R55
R56
cuit. To enhance the resolution of analog to digital convert-
er, use independent power source as well as possible, other
than digital power source.
SIN (Serial data input)
SOUT (Serial data output)
PWM1O (PWM1 Output)
T1O (Timer/Counter 1 output)
AVSS
: ADC circuit ground.
RESETB
: Reset the MCU.
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.
XI
: Input to the inverting oscillator amplifier and input to
the internal clock operating circuit.
XO
: Output from the inverting oscillator amplifier.
RA(Vdisp
)
: RA is one-bit high-voltage input only port pin.
Port pin
Alternate function
AN0 (Analog Input 0)
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
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
RA
V
disp (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
Alternate function
R00
R01
R02
R03
INT0 (External interrupt 0)
INT1 (External interrupt 1)
EC0 (Event counter input)
BUZO (Buzzer driver output)
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.
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-
Nov. 1999 Ver 0.0
preliminary
13
HYNIX [ HYNIX SEMICONDUCTOR ]
