GMS82512/16/24
HYUNDAI MicroElectronics
5. PIN FUNCTION
V
DD
: Supply voltage.
V
SS
: Circuit ground.
TEST:
Used for Test Mode. For normal operation, it
should be connected to V
DD
.
RESET:
Reset the MCU.
X
IN
: Input to the inverting oscillator amplifier and input to
the internal main clock operating circuit.
X
OUT
: Output from the inverting oscillator amplifier.
R00~R07:
R0 is an 8-bit CMOS bidirectional I/O port. R0
pins 1 or 0 written to the Port Direction Register, can be
used as outputs or inputs.
R20~R27:
R2 is an 8-bit CMOS bidirectional I/O port. R2
pins 1 or 0 written to the Port Direction Register can be
used as outputs or inputs.
R30~R37:
R3 is an 8-bit CMOS bidirectional I/O port. R3
pins 1 or 0 written to the Port Direction Register can be
used as outputs or inputs.
R40~R44:
R4 is an 5-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 functions of the various follow-
ing special features.
Port pin
R40
R41
R42
R43
R44
Alternate function
INT0 (External interrupt 0)
INT1 (External interrupt 1)
INT2 (External interrupt 2)
INT3 (External interrupt 3)
EC0 (Event counter input 0)
Port pin
R54
R55
Alternate function
WDTO (Watchdog Timer output)
BUZ (Buzzer driver output)
R54~R55:
R5 is an 2-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 functions of the various follow-
ing special features.
R64~R67:
R6 is an 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, R6 is shared with the ADC input.
Port pin
R64
R66
R66
R67
Alternate function
AN4 (Analog Input 4)
AN5 (Analog Input 5)
AN6 (Analog Input 6)
AN7 (Analog Input 7)
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.
6
FEB. 2000 Ver 1.00
HYNIX [ HYNIX SEMICONDUCTOR ]
