Port 3 Pull-Up Mos Control Register (P3Pcr); Pin Functions - Renesas H8S/2437 Hardware Manual

7.4.4

Port 3 Pull-Up MOS Control Register (P3PCR)

P3PCR controls the on or off state of input pull-up MOSs for port 3.
Bit Bit Name
7 P37PCR
6 P36PCR
5 P35PCR
4 P34PCR
3 P33PCR
2 P32PCR
1 P31PCR
0 P30PCR
7.4.5

Pin Functions

When the corresponding bit in PTCNT1 is set to 1, port 3 pins can be used as interrupt input pins
(ExIRQ3 to ExIRQ0). In normal extended mode, port 3 pins function as data I/O pins. In
multiplex extended mode, operation of port 3 pins is the same as that in single-chip mode. The
relationship between register setting values and pin functions is as follows.
• P37/D15
The pin function is switched as shown below according to the operating mode and the
P37DDR bit.
Normal
Extended Mode
(ADMXE = 0)
P37DDR
Pin function D15 I/O pin
Initial Value R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
Extended Mode (EXPE = 1)
Multiplex Extended Mode
(ADMXE = 1)

0
P37 input pin
Description
•
In normal extended mode
Operation is not affected.
•
In multiplex extended mode
Operates as single-chip mode
•
In single-chip mode
When the pins are in the input states, the
corresponding input pull-up MOS is turned on
when a P3PCR bit is set to 1.
Single-Chip Mode (EXPE = 0)
1
P37 output pin P37 input pin
Rev. 1.00, 09/03, page 157 of 704
0 1
P37 output pin