Chapter 2 Pin Functions; Pin Function List; Normal Operating Mode Pins - NEC mPD780208 Subseries User Manual

2.1 Pin Function List

2.1.1 Normal operating mode pins

(1) Port pins (1/2)
Pin Name I/O
Port 0.
P00 Input
5-bit I/O port.
P01 I/O
P02
P03
Note 1
P04 Input
P10 to P17 I/O Port 1.
8-bit I/O port.
Input/output can be specified in 1-bit units.
If used as an input port, use of an on-chip pull-up resistor can be
specified by software settings
P20 I/O Port 2.
8-bit I/O port.
P21
Input/output can be specified in 1-bit units.
P22
If used as an input port, use of an on-chip pull-up resistor can be
specified by software settings.
P23
P24
P25
P26
P27
P30 I/O
Port 3.
8-bit I/O port.
P31
Input/output can be specified in 1-bit units.
P32
LEDs can be driven directly.
P33
If used as an input port, use of an on-chip pull-up resistor can be
specified by software settings.
P34
In mask ROM versions, use of an on-chip pull-down resistor can be
P35
specified in 1-bit units with the mask option.
P36
P37
Notes 1. When the P04/XT1 pin is used as an input port, set bit 6 (FRC) of the processor clock control register
(PCC) to 1 (do not use the feedback resistor contained in the subsystem clock oscillator).
2. When the P10/ANI0 to P17/ANI7 pins are used as analog inputs of the A/D converter, set port 1 to
the input mode. In this case, its on-chip pull-up resistor will be automatically disabled.
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CHAPTER 2 PIN FUNCTIONS

Function
Input only
Input/output can be specified in 1-bit units.
If used as an input port, use of an on-chip
pull-up resistor can be specified by
software settings.
Input only
Note 2
.
User's Manual U11302EJ4V0UM
After Alternate
Reset Function
Input INTP0/TI0
Input INTP1
INTP2
INTP3
Input XT1
Input ANI0 to ANI7
Input SI1
SO1
SCK1
STB
BUSY
SI0/SB0
SO0/SB1
SCK0
Input TO0
TO1
TO2
TI1
TI2
PCL
BUZ
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