GMS81508B HYNIX [Hynix Semiconductor], GMS81508B Datasheet - Page 11

• Manufacturer Part Number: GMS81508B
• Description: HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: HYNIX [Hynix Semiconductor]

GMS81508B/16B/24B
5. PIN FUNCTION
V
V
TEST: Used for Test Mode. For normal operation, it
should be connected to V
RESET: Reset the MCU.
X
the internal main clock operating circuit.
X
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.
R10~R17: R1 is an 8-bit CMOS bidirectional I/O port. R1
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~R47: R4 is an 8-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.
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
8
DD
SS
IN
OUT
Port pin
: Circuit ground.
: Input to the inverting oscillator amplifier and input to
: Supply voltage.
: Output from the inverting oscillator amplifier.
R40
R41
R42
R43
R44
R45
R46
R47
INT0 (External interrupt 0)
INT1 (External interrupt 1)
INT2 (External interrupt 2)
INT3 (External interrupt 3)
EC0 (Event counter input 0)
EC2 (Event counter input 2)
T1O (Timer/Counter 1 output)
T3O (Timer/Counter 3 output)
DD
Alternate function
.
used as outputs or inputs.
In addition, R5 serves the functions of the various follow-
ing special features.
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.
Note: On the MDS Choice, when the MCU is RESET, R60
can not be used digital input port. For more detail, refer to
"9. I/O PORTS" on page 31.
AV
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
DD
SS
Port pin
Port pin
: ADC circuit ground.
R50
R51
R52
R53
R54
R55
R56
R57
R60
R61
R62
R63
R64
R66
R66
R67
: Supply voltage to the ladder resistor of ADC cir-
SIN (Serial data input)
SOUT (Serial data output)
SCLK (Serial clock)
SRDY (Serial ready)
WDTO (Watchdog Timer output)
BUZ (Buzzer driver output)
PWM0 (PWM output 0)
PWM1 (PWM output 1)
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)
HYUNDAI MicroElectronics
Alternate function
Alternate function
DEC. 1999 Ver 1.04