Renesas Hitachi H8S/2191, Hardware Manual, Page: 312 / 1065

Rev. 2.0, 11/00, page 285 of 1037
Bit 1: P81/EXCAP Pin Switching (PMR81)
PMR81 sets whether the P83/EXCAP pin is used as a P81 I/O pin or an EXTTRG pin for the
capstan external synchronous signal input.
Bit 1
PMR81 Description
0 The P81/EXCAP pin functions as a P81 I/O pin (Initial value)
1 The P81/EXCAP pin functions as an EXCAP input pin
Bit 0: P80/EXTTRG Pin Switching (PMR80)
PMR80 sets whether the P80/EXTTRG pin is used as a P80 I/O pin or an EXTTRG pin for the
external trigger signal input.
Bit 0
PMR80 Description
0 The P80/EXTTRG pin functions as a P80 I/O pin (Initial value)
1 The P80/EXTTRG pin functions as an EXTTRG input pin
(2) Port Control Register 8 (PCR8)
0
0
1
0
W
2
0
W
3
0
4
0
W
0
W
5 6
0
7
PCR84 PCR83 PCR82 PCR81 PCR80
0
W
PCR87
W W W
PCR86 PCR85
Bit :
Initial value :
R/W :
Port control register 8 (PCR8) controls the I/Os of pins P87 to P80 of port 8 in a unit of bit.
When PCR8 is set to 1, the corresponding P87 to P80 pins become output pins, and when it is set
to 0, they become input pins. When the corresponding pin is set to a general I/O, settings of
PCR8 and PDR8 become valid.
PCR8 is an 8-bit write-only register. When PCR8 is read, 1 is read. When reset, PCR8 is
initialized to H'00.
Bit n
PCR8n Description
0 The P8n pin functions as an input pin (Initial value)
1 The P8n pin functions as an output pin
(n = 7 to 0)