Port Functions - NEC mPD780208 Subseries User Manual

Pin Name
P00
Port 0.
5-bit I/O port.
P01
P02
P03
P04
P10 to P17 Port 1.
8-bit I/O port.
Input/output can be specified in 1-bit units.
If used as an input port, on-chip pull-up resistors can be used by software settings.
Port 2.
P20
8-bit I/O port.
P21
Input/output can be specified in 1-bit units.
P22
If used as an input port, on-chip pull-up resistors can be used by software settings.
P23
P24
P25
P26
P27
Port 3.
P30
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, on-chip pull-up resistors can be used by software settings.
In mask ROM versions, use of pull-down resistors can be specified in 1-bit units with
P34
the mask option.
P35
P36
P37
P70 to P74 Port 7.
N-ch open-drain 5-bit I/O port.
Input/output can be specified in 1-bit units.
LEDs can be driven directly.
In mask ROM versions, use of pull-up resistors can be specified in 1-bit units with the
mask option.
P80 to P87 Port 8.
P-ch open-drain 8-bit high withstanding voltage output port.
LEDs can be driven directly.
In mask ROM versions, use of pull-down resistors can be specified in 1-bit units with
the mask option (can be specified as connected to V
P90 to P97 Port 9.
P-ch open-drain 8-bit high withstanding voltage output port.
LEDs can be driven directly.
In mask ROM versions, use of pull-down resistors can be specified in 1-bit units with
the mask option (can be specified as connected to V
CHAPTER 4 PORT FUNCTIONS
Table 4-1. Port Functions (1/2)
Function
Input only.
Input/output can be specified in 1-bit units.
If used as an input port, on-chip pull-up resistors
can be used by software settings.
Input only.
LOAD
LOAD
User's Manual U11302EJ4V0UM
or V in 4-bit units).
SS
or V in 4-bit units).
SS
Alternate
Function
INTP0/TI0
INTP1
INTP2
INTP3
XT1
ANI0 to ANI7
SI1
SO1
SCK1
STB
BUSY
SI0/SB0
SO0/SB1
SCK0
TO0
TO1
TO2
TI1
TI2
PCL
BUZ
–
–
FIP13 to FIP20
FIP21 to FIP28
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