UPD78F9500MA-CAC-A Datasheet, PDF (57/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

<R>
<R>
CHAPTER 4 PORT FUNCTIONS
Table 4-2. Port Functions (μPD78F950x)
Pin Name
I/O
Function
After Reset
Alternate-
Function Pin
P20
P21
P22
P23^Note
I/O
Port 2.
Input
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.
TOH1
INTP0
−
EXCLK^Note
P32
P34^Note
I/O
Input
Port 3.
On-chip pull-up
resistor can be
connected by
setting software.
Can be set to input or output mode in 1- Input
bit units.
Input only
Input
INTP1
RESET^Note
P40 and P43
I/O
Port 4.
Input
−
2-bit I/O port.
Can be set to input or output mode in 1-bit units.
On-chip pull-up resistor can be connected setting software.
Note For the setting method for pin functions, see CHAPTER 15 OPTION BYTE.
Caution The P22 and P23/EXCLK pins are pulled down during reset. The P34/RESET pin is pulled up during
reset by the reset pin function/power-on clear circuit.
Remark P23 can be allocated when the high-speed internal oscillation is selected as the system clock.
4.2 Port Configuration
Ports consist of the following hardware units.
Item
Control registers
Ports
Pull-up resistor
Table 4-3. Configuration of Ports
Configuration
Port mode registers (PM2 to PM4)
Port registers (P2 to P4)
Port mode control register 2 (PMC2) (μPD78F920x only)
Pull-up resistor option registers (PU2 to PU4)
Total: 8 (CMOS I/O: 7, CMOS input: 1)
Total: 7
User’s Manual U18172EJ3V0UD
55