H838024 datasheet(283/697 Pages) RENESAS

Part #	H838024

Description	Renesas 8-Bit Single-Chip Microcomputer Super Low Power Series

PDF	697 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 8 I/O Ports

Rev. 7.00 Mar 10, 2005 page 241 of 652

REJ09B0042-0700

8.12.2

Table 8.31 shows the registers used by the input/output data inversion function.

Table 8.31

Name

Abbr.

R/W

Address

Serial port control register

SPCR

R/W

H'FF91

Serial Port Control Register (SPCR)

Bit

Initial value

Read/Write



SPC32

R/W



SCINV3

R/W



SCINV2

R/W



SPCR is an 8-bit readable/writable register that performs RXD32 and TXD32 pin input/output data

inversion switching.

Bits 7 and 6—Reserved

Bits 7 and 6 are reserved; they are always read as 1 and cannot be modified.

Bit 5—P42/TXD32 Pin Function Switch (SPC32)

This bit selects whether pin P42/TXD32 is used as P42 or as TXD32.

Bit 5

SPC32

Description

Functions as P42 I/O pin

(initial value)

Functions as TXD32 output pin*

Note: * Set the TE bit in SCR3 after setting this bit to 1.

Bit 4—Reserved

Bit 4 is reserved; it can only be written with 0.

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