HD64F3642AHV Datasheet, PDF (205/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 8 I/O Ports
Bits 7 to 3 Reserved Bits: Bits 7 to 3 are reserved; they are always read as 1, and cannot be
modified.
Bit 2 P2₂/TXD Pin Function Switch (TXD): Bit 2 selects whether pin P2₂/TXD is used as P2₂
or as TXD.
Bit 2: TXD
0
1
Description
Functions as P22 I/O pin
Functions as TXD output pin
(initial value)
Bit 1 Reserved Bit: Bit 1 is reserved: it is always read as 0 and cannot be modified.
Bit 0 P3₂/SO₁ Pin PMOS Control (POF1): This bit controls the PMOS transistor in the
P3₂/SO₁ pin output buffer.
Bit 0: POF1
0
1
Description
CMOS output
NMOS open-drain output
(initial value)
Rev. 6.00 Sep 12, 2006 page 183 of 526
REJ09B0326-0600