Rev. 1.00, 09/03, page 157 of 704
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
Initial Value
R/W
Description
7 P37PCR
0
R/W
6 P36PCR
0
R/W
5 P35PCR
0
R/W
4 P34PCR
0
R/W
3 P33PCR
0
R/W
2 P32PCR
0
R/W
1 P31PCR
0
R/W
0 P30PCR
0
R/W
•
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.
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.
Extended Mode (EXPE = 1)
Normal
Extended Mode
(ADMXE = 0)
Multiplex Extended Mode
(ADMXE = 1)
Single-Chip Mode (EXPE = 0)
P37DDR
0 1 0 1
Pin function
D15 I/O pin
P37 input pin
P37 output pin
P37 input pin P37 output pin
Summary of Contents for H8S/2437
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