W78ERD2_07 Datasheet, PDF (21/76 Pages) Winbond – 8-BIT MICROCONTROLLER

W78ERD2/W78ERD2A
BIT
NAME
FUNCTION
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.
7, 6
P43FUN1 _{10: Mode 2. P4.3 is a write-strobe signal for chip-select purposes. The}
P43FUN0
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.
Chip-select signal address comparison:
00: Compare the full 16-bit address with P43AH and P43AL.
5, 4 ^P43CMP1 01: Compare the 15 MSB of the 16-bit address with P43AH and P43AL.
P43CMP0 _{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.
P42FUN1
3, 2 _P42FUN0 P4.2 function control bits, similar to P43FUN1 and P43FUN0 above.
1, 0
P42CMP1 _{P4.2 address-comparator length control bits, similar to P43CMP1 and}
P42CMP0 ^{P43CMP0 above.}
F/W Flash Low Address
Bit:
7
6
5
4
3
2
1
0
Mnemonic: SFRAL Address: C4h
F/W flash low byte address
F/W Flash High Address
Bit:
7
6
5
4
3
2
1
0
Mnemonic: SFRAH Address: C5h
F/W flash high byte address
F/W Flash Data
Bit:
7
6
5
4
3
2
1
0
Mnemonic: SFRFD
F/W flash data
Address: C6h
- 21 -
Publication Release Date: February 14, 2007
Revision A10