IBM (2) Pins other than port pins, 2.1.2 PROM programming mode pins (, PD78P083 only)

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CHAPTER 2 PIN FUNCTION
Pin Name Input/Output Function After Reset Alternate Function
INTP1 Input External interrupt request input by which the active edge Input P01
INTP2 (rising edge, falling edge, or both rising and falling edges) P02
INTP3 can be specified. P03
SI2 Input Serial interface serial data input. Input P70/RxD
SO2 Output Serial interface serial data output. Input P71/TxD
SCK2 Input/output Serial interface serial clock input/output. Input P72/ASCK
RxD Input Asynchronous serial interface serial data input. Input P70/SI2
TxD Output Asynchronous serial interface serial data output. Input P71/SO2
ASCK Input Asynchronous serial interface serial clock input. Input P72/SCK2
TI5 Input External count clock input to 8-bit timer (TM5). Input P100/TO5
TI6 External count clock input to 8-bit timer (TM6). P101/TO6
TO5 Output 8-bit timer output. (also used for 8-bit PWM output) Input P100/TI5
TO6 P101/TI6
PCL Output Clock output. (for main system clock trimming) Input P35
BUZ Output Buzzer output. Input P36
ANI0-ANI7 Input A/D converter analog input. Input P10-P17
AVREF Input A/D converter reference voltage input. – –
AVDD – A/D converter analog power supply. Connected to VDD.– –
AVSS – A/D converter ground potential. Connected to VSS.– –
RESET Input System reset input. – –
X1 Input Main system clock oscillation crystal connection. – –
X2 – ––
V
DD – Positive power supply. – –
VPP – High-voltage applied during program write/verification. – –
Connected directly to VSS in normal operating mode.
VSS – Ground potential. – –
IC – Internal connection. Connect directly to VSS.––
NC – Does not internally connected. Connect to VSS.––
(It can be left open)
(2) Pins other than port pins
2.1.2 PROM programming mode pins ( µ PD78P083 only)
Pin Name Input/Output Function
RESET Input PROM programming mode setting.
When +5 V or +12.5 V is applied to the VPP pin or a low level voltage is applied to the
RESET pin, the PROM programming mode is set.
VPP Input High-voltage application for PROM programming mode setting and program write/verify.
A0 to A14 Input Address bus
D0 to D7 Input/output Data bus
CE Input PROM enable input/program pulse input
OE Input Read strobe input to PROM
PGM Input Program/program inhibit input in PROM programming mode
VDD — Positive power supply
VSS — Ground potential