Renesas Hitachi H8S/2191, Hardware Manual

Page: 276 / 1065

Rev. 2.0, 11/00, page 249 of 1037
Bit 5: P25/SI2 Pin Switching (PMR25)
PMR26 sets whether the P25/SI2 pin as a P25 I/O pin or an SI2 pin for the SCI2 receive data
input.
Bit 5
PMR25 Description
0 The P25/SI2 pin functions as a P25 I/O pin (Initial value)
1 The P25/SI2 pin functions as an SI2 input pin
Bits 4 to 1: Reserved Bits
When the bits are read, 1 is always read. The write operation is invalid.
Bit 0: P26/SO2 Pin PMOS Control (PMR20)
PMR20 controls the PMOS ON and OFF of the P26/SO2 pin output buffer.
Bit 0
PMR20 Description
0 The P26/SO2 pin functions as CMOS output (Initial value)
1 The P26/SO2 pin functions as NMOS open drain output
(2) Port Control Register 2 (PCR2)
0
0
1
0
W
2
0
W
3
0
4
0
W
0
W
5
0
7
0
W W W W
6
PCR24 PCR23 PCR22 PCR21 PCR20 PCR27 PCR26 PCR25
Bit :
Initial value :
R/W :
Port control register 2 (PCR2) controls the I/Os of pins P27 to P20 of port 2 in a unit of bit.
When PCR2 is set to 1, the corresponding P27 to P20 pins become output pins, and when it is set
to 0, they become input pins. When the relevant pin is set to a general I/O by PMR1, settings of
PCR2 and PDR2 are valid.
PCR2 is an 8-bit write-only register. When PCR2 is read, 1 is read. When reset, PCR2 is
initialized to H'00.
Bit n
PCR2n Description
0 The P2n pin functions as an input pin (Initial value)
1 The P2n pin functions as an output pin
(n = 7 to 0)