HD6433802H Datasheet, PDF(184/435 Page) Hitachi Semiconductor – Single-Chip Microcomputer

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HD6433802H Datasheet, PDF (184/435 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

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2. Port mode register B (PMRB)

Bit

7

6

5

4

3

2

1

0

â

â

â

â

IRQ1

â

â

â

Initial value

1

1

1

1

0

1

1

1

Read/Write

â

â

â

â

R/W

â

â

â

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

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

Bit 3: PB3/AN3/IRQ1 pin function switch (IRQ1)

These bits select whether pin PB3/AN3/IRQ1 is used as PB3/AN3 or as IRQ1.

Bit 3

IRQ1

Description

0

Functions as PB3/AN3 input pin

1

Functions as IRQ1 input pin

Note: Rising or falling edge sensing can be selected for the IRQ1 pin.

(initial value)

166

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