W78IRD2 datasheet(21/76 Pages) ETC2

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W78IRD2

Publication Release Date: October 2, 2006

- 21 -

Revision A7

BIT

NAME

FUNCTION

7, 6

P41FUN1

P41FUN0

P4.1 function control bits, similar to P43FUN1 and P43FUN0 below.

5, 4

P41CMP1

P41CMP0

P4.1 address-comparator length control bits, similar to P43CMP1 and

P43CMP0 below.

3, 2

P40FUN1

P40FUN0

P4.0 function control bits, similar to P43FUN1 and P43FUN0 below.

1, 0

P40CMP1

P40CMP0

P4.0 address-comparator length control bits, similar to P43CMP1 and

P43CMP0 below.

Port 4 Control Register B

Bit:

P43FUN1 P43FUN0 P43CMP1 P43CMP0 P42FUN1 P42FUN0 P42CMP1 P42CMP0

Mnemonic: P4CONB

Address: C3h

BIT

NAME

FUNCTION

7, 6

P43FUN1

P43FUN0

00: Mode 0. P4.3 is a general purpose I/O port, like Port 1.

01: Mode 1. P4.3 is a read-strobe signal for chip-select purposes. The

address range depends on SFR P43AH, P43AL, P43CMP1 and

P43CMP0.

10: Mode 2. P4.3 is a write-strobe signal for chip-select purposes. The

address range depends on SFR P43AH, P43AL, P43CMP1 and

P43CMP0.

11: Mode 3. P4.3 is a read/write-strobe signal for chip-select purposes. The

address range depends on SFR P43AH, P43AL, P43CMP1, and

P43CMP0.

5, 4

P43CMP1

P43CMP0

Chip-select signal address comparison:

00: Compare the full 16-bit address with P43AH and P43AL.

01: Compare the 15 MSB of the 16-bit address with P43AH and P43AL.

10: Compare the 14 MSB of the 16-bit address with P43AH and P43AL.

11: Compare the 8 MSB of the 16-bit address with P43AH.

3, 2

P42FUN1

P42FUN0

P4.2 function control bits, similar to P43FUN1 and P43FUN0 above.

1, 0

P42CMP1

P42CMP0

P4.2 address-comparator length control bits, similar to P43CMP1 and

P43CMP0 above.

W78IRD2 Datasheet(PDF) 21 Page - List of Unclassifed Manufacturers

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