JVC MX-GT700 Service Manual page 35

3. Pin function
Symbol I/O Function
VSS1,2 - Power pin (-)
VDD1,2,3,4 - Power pin (+)
VP - Power pin (+) for the VFD output pull-down resist
PORT0 I/O 8-bit input/output port
P00 to P07 Input for port 0 interrupt
Input/output in nibble units
Input for HOLD release
15V withstand at N-channel open drain ontput
PORT1 I/O 8-bit input/output port
P10 to P17 input/ontput can be specified in abit unit
Other functions
(P10 SIO0 data output, P11 SIO0 data input/bus input/output, P12 SIO0 clock input/output,
P13 SIO1 data output, P14 SIO1 data input/bus input/output, P15 SIO1 clock input/output,
P16 Buzzer output, P17 Timer 1 output)
PORT3 I/O 8-bit input/output port
P30 to P37 Input/output in bit unit
15V withstand at N-channel poen drain output
PORT7 4-bit input/output port
Input/output in bit unit
2-bit input port
Other functions
P70 to P73 I/O (P70 : INT0 input/HOLD release/N-channel Tr. output for watchdog timer, P71 : INT1 input/
P74 to P75 I HOLD release input, P72 : INT2 input/timer event input, P73 : INT3 input with nise filter/timer
0 event input, P74 : 32.768kHz crystal oscillation terminal XT1, P75 : 32,768kHz crystal
oscillation terminal XT2)
PORT8 4-bit input port
P80 to 83 I Input/output in bit unit
P84 to 87 I/O 4-bit input port
Other function
(AD input port)
S0/T0 to O Output for VFD display controller segment/timing in common
S6/T6
S7/T7 to O Output for VFD display controller segment/timing with internal pull-down resistor in common
S15/T15 Internal pull-down resistor output
S16 to S31 I/O Output for VFD display controller Segment output
S32 to S47 I/O Output for VFD display controller Segment
S48 to S51 I/O Output for VFD display controller Segment
RES I Reset pin
XT1/P74 I Input pin for 32.768kHz crystal oscillation
XT2/P75 O Input pin for 32.768kHz crystal oscillation
CF1 I Input pin for the ceramic resonator osdillation
CF2 O Output pin for the ceramic reconator oscillation
MX-GT700
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