Renesas H8/3847R Series Hardware Manual page 253

• H8/38347 Group and H8/38447 Group
Bit 7
EXCL
Initial value 0
Read/Write R/W
PMR2 is an 8-bit read/write register that controls the selection of pin functions for pins P2
and P2 , the PMOS on/off state for the P2
3
Upon reset, PMR2 is initialized to H'58.
• H8/3847R Group and H8/3847S Group
Bit 7: Reserved bit
Bit 7 is reserved. It is always read as 1 and cannot be modified.
• H8/38347 Group and H8/38447 Group
Bit 7: P31/UD/EXCL pin function switch (EXCL)
This bit selects whether pin P31/UD/EXCL is used as P31/UD or as EXCL. When the pin is used
as EXCL an external clock should be input to it. See section 4, Clock Pulse Generators, for a
connection example.
Bit 7
EXCL Description
0 Functions as P31/UD I/O pin
1 Functions as EXCL input pin
Bits 6, 4, and 3: Reserved bits
Bits 6, 4, and 3 are reserved; they are always read as 1 and cannot be modified.
Bit 5: P2 /SO pin PMOS control (POF1)
2 1
This bit controls the on/off state of the P2
Bit 5
POF1 Description
0 CMOS output
1 NMOS open-drain output
6 5 4
— POF1 —
1 0 1
— R/W —
/SO pin, and external clock input to pin P31.
2 1
/SO pin output buffer PMOS.
2 1
3 2
— SO1
1 0
— R/W
Rev. 6.00 Aug 04, 2006 page 215 of 680
Section 8 I/O Ports
1 0
SI1 SCK1
0 0
R/W R/W
, P2 ,
0 1
(initial value)
(initial value)
REJ09B0145-0600