UPD78F9177 NEC, UPD78F9177 Datasheet - Page 11

• Manufacturer Part Number: UPD78F9177
• Description: 8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

3. PIN FUNCTIONS
3.1
P00 to P05
P10, P11
P20
P21
P22
P23
P24
P25
P26
P30
P31
P32
P33
P50 to P53
P60 to P67
Pin Name
Note
Port Pins
PD78F9177Y only
Input
I/O
I/O
I/O
I/O
I/O
I/O
Port 0
6-bit input/output port
Input/output mode can be specified in 1-bit units
When used as an input port, an on-chip pull-up resistor can be
specified by software.
Port 1
2-bit input/output port
Input/output mode can be specified in 1-bit units
When used as an input port, an on-chip pull-up resistor can be
specified by software.
Port 2
7-bit input/output port
Input/output mode can be specified in 1-bit units
For P20 to P22, P25, and P26, an on-chip pull-up resistor can be
specified by software.
Only P23 and P24 can be used as N-ch open-drain
input/output port pins.
Port 3
4-bit input/output port
Input/output mode can be specified in 1-bit units
On-chip pull-up resistor can be specified by software.
Port 5
4-bit N-ch open-drain input/output port
Input/output mode can be specified in 1-bit units
Port 6
8-bit input-only port
Data Sheet U14022EJ1V0DS00
Function
PD78F9177, 78F9177Y
After Reset
Input
Input
Input
Input
Input
Input
SCK20/ASCK20
SO20/TxD20
SI20/RxD20
SCL0
SDA0
TI80/SS20
TO80
INTP0/TI81/CPT90
INTP1/TO81
INTP2/TO90
INTP3/TO82/BZO90
ANI0 to ANI7
Alternate Function
Note
Note
11