HD64F3642AHV Datasheet, PDF (204/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 8 I/O Ports
PMR3 is an 8-bit read/write register, controlling the selection of pin functions for port 3 pins.
Upon reset, PMR3 is initialized to H'00.
Bits 7 to 3 Reserved Bits: Bits 7 to 3 are reserved: they are always read as 0 and cannot be
modified.
Bit 2 P3₂/SO₁ Pin Function Switch (SO1): This bit selects whether pin P3₂/SO₁ is used as P3₂
or as SO₁.
Bit 2: SO1
0
1
Description
Functions as P32 I/O pin
Functions as SO1 output pin
(initial value)
Bit 1 P3₁/SI₁ Pin Function Switch (SI1): This bit selects whether pin P3₁/SI₁ is used as P3₁ or
as SI₁.
Bit 1: SI1
0
1
Description
Functions as P31 I/O pin
Functions as SI1 input pin
(initial value)
Bit 0 P3₀/SCK₁ Pin Function Switch (SCK1): This bit selects whether pin P3₀/SCK₁ is used
as P3₀ or as SCK₁.
Bit 0: SCK1
0
1
Description
Functions as P30 I/O pin
Functions as SCK1 I/O pin
(initial value)
Port Mode Register 7 (PMR7)
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0





TXD

POF1
1
1
1
1
1
0
0
0





R/W

R/W
PMR7 is an 8-bit read/write register that turns the PMOS transistors of pins and P3₂/SO₁ on and
off.
Upon reset, PMR7 is initialized to H'F8.
Rev. 6.00 Sep 12, 2006 page 182 of 526
REJ09B0326-0600