Hynix Semiconductor GMS81508A, User Manual, Page: 10 / 91

GMS81508/16
5
1.5. PIN DESCRIPTION
Classification No. Symbol I/O Descriptions
Power 1 Vdd I Power Supply Input Pin(4.5~5.5V)
32 Vss I Ground(0V)
2 MP
I Controls Microprocess Mode of the Chip
At "H" input : Single Chip Mode
At "L" input : Microprocess Mode
System Control
or
29 RESET I In the state of "L" level, system enter to the reset
state.
Clock
30 Xin
I This chip has an internal clock generating circuit. To
control generating frequency, an external ceramic or
a quartz crystal oscillator is connected between Xin
and Xout pins.
31 Xout I If external clock is used, the clock source should be
connected to the Xin pin and the Xout pin should be
left open.
24 EC0 I Event Counter Source Clock Input Pin
Timer 23 EC2 I
22 T1O O Timer Counter Overflow Output Pin
21 T3O O
28 INT0 I
Ext. Interrupt 27 INT1 I External Interrupt Request Signal Input Pin
26 INT2 I
25 INT3 I
4 AVref I Reference Voltage Input Pin for A/D Converter
3 AVss I Ground Level Input Pin for A/D Converter
12 AN0 I
11 AN1 I
A/D Converter 10 AN2 I
9 AN3 I Analog Voltage Input Pin for A/D Converter
8 AN4 I
7 AN5 I
6 AN6 I
5 AN7 I
17 Srdy I/O Receive Enable Output Pin
Serial I/O 18 Sclk I/O Serial Clock Output Pin
19 Sout O Serial Data Output Pin
20 Sin I Serial Data Input Pin
P.W.M 14 PWM0 O PWM Pulse Output Pin
13 PWM1 O
Buzzer 15 BUZ O Buzzer Driving Frequency Output Pin
W.D.T 16 WDTO O Watch dog Timer Overflow Output Pin