H8SSLASH2225 datasheet(420/1071 Pages) RENESAS

420 / 1071 page

Section 10 I/O Ports

Rev. 5.00 Aug 08, 2006 page 334 of 982

REJ09B0054-0500

10.7.3

Port B Register (PORTB)

PORTB shows the pin states and cannot be modified.

Bit

Bit Name

Initial Value

R/W

Description

PB7

*

PB6

*

PB5

*

PB4

*

PB3

*

PB2

*

PB1

*

PB0

*

If these bits are read while the corresponding PBDDR

bits are set to 1, the PBDR value is read. If these bits

are read while PBDDR bits are cleared to 0, the pin

states are read.

Note:

* Determined by the states of pins PB7 to PB0.

10.7.4

Port B Pull-Up MOS Control Register (PBPCR)

PBPCR controls the on/off state of port B input pull-up MOS.

Bit

Bit Name

Initial Value

R/W

Description

PB7PCR

R/W

PB6PCR

R/W

PB5PCR

R/W

PB4PCR

R/W

PB3PCR

R/W

PB2PCR

R/W

PB1PCR

R/W

PB0PCR

R/W

When a pin is specified as an input port, setting the

corresponding bit to 1 turns on the input pull-up

MOS for that pin.

10.7.5

Pin Functions

Port B pins also function as TPU I/O pins (TPU_3*, TPU_4*, and TPU_5*) and address output

pins. The values of register and pin functions are shown bellow.

Note: * Not available in the H8S/2227 Group.

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