H838024 datasheet(280/697 Pages) RENESAS

280 / 697 page

Section 8 I/O Ports

Rev. 7.00 Mar 10, 2005 page 238 of 652

REJ09B0042-0700

Port Data Register B (PDRB)

Bit

Read/Write

PB7

PB6

PB5

PB4

Reading PDRB always gives the pin states. However, if a port B pin is selected as an analog input

channel for the A/D converter by AMR bits CH3 to CH0, that pin reads 0 regardless of the input

voltage.

Port Mode Register B (PMRB)

Bit

Initial value

Read/Write



IRQ1

R/W



PMRB is an 8-bit read/write register controlling the selection of the PB3 pin function. Upon reset,

PMRB is initialized to H'F7.

Bits 7 to 4 and 2 to 0—Reserved

Bits 7 to 4 and 2 to 0 are reserved; they are always read as 1 and cannot be modified.

Bit 3—PB3/AN3/

IRQ

1 Pin Function Switch (IRQ1)

These bits select whether pin PB3/AN3/

IRQ

1 is used as PB3/AN3 or as

IRQ

1/TMIC.

Bit 3

IRQ1

Description

Functions as PB3/AN3 input pin

(initial value)

Functions as

IRQ

1/TMIC input pin

Note:

Rising or falling edge sensing can be selected for the

IRQ

1/TMIC pin.

For TMIC pin setting information, see the Timer More Register C (TMC) description in section

9.3.2, Register Descriptions.

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