UPD78F9234MC-5A4-A Datasheet, PDF (55/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 4 PORT FUNCTIONS
Table 4-1. Port Functions
Pin Name
I/O
Function
After Reset
P00 to P03 I/O
Port 0.
4-bit I/O port.
Can be set to input or output mode in 1-bit units.
On-chip pull-up resistor can be connected by setting software.
Input
P20 to P23 I/O
Port 2.
4-bit I/O port.
Can be set to input or output mode in 1-bit units.
On-chip pull-up resistor can be connected by setting software.
Input
P30
I/O
Port 3
P31
P32
Can be set to input or output mode in 1-
bit units.
On-chip pull-up resistor can be
connected by setting software.
Input
P33
P34^Note
Input
Input only
Input
P40
I/O
Port 4.
Input
P41
8-bit I/O port.
Can be set to input or output mode in 1-bit units.
P42
On-chip pull-up resistor can be connected by setting software.
P43
P44
P45
P46
P47
P120
I/O
P121^Note
P122^Note
P123
Port 12.
4-bit I/O port.
Can be set to input or output mode in 1-bit units.
On-chip pull-up resistor can be connected only to P120 and
P123 by setting software.
Input
P130
Output
Port 13.
1-bit output-only port.
Output
Note For settings of alternate function, refer to CHAPTER 18 OPTION BYTE.
Alternate-
Function Pin
−
ANI0 to ANI3
TI000/INTP0
TI010/TO00/
INTP2
−
−
RESET^Note
−
INTP3
TOH1
TxD6/INTP1
RxD6
−
−
−
−
X1^Note
X2^Note
−
−
Caution The P121/X1 and P122/X2 pins are pulled down during reset.
Remarks 1. P121 and P122 can be allocated when the high-speed internal oscillation is selected as the system
clock.
2. P122 can be allocated when an external clock is selected as the system clock.
User’s Manual U17446EJ5V0UD
53