W77E516 查看數據表（PDF） - Winbond
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W77E516 Datasheet PDF : 85 Pages
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Preliminary W77E516
BIT NAME
FUNCTION
P4xM1, P4xM0 Port 4 alternate modes.
= 00: Mode 0. P4.x is a general purpose I/O port which is the same as Port 1.
= 01: Mode 1. P4.x is a Read Strobe signal for chip select purpose. The
address range depends on the SFR P4xAH, P4xAL and bits P4xC1, P4xC0.
= 10: Mode 2. P4.x is a Write Strobe signal for chip select purpose. The
address range depends on the SFR P4xAH, P4xAL and bits P4xC1, P4xC0.
= 11: Mode 3. P4.x is a Read/Write Strobe signal for chip select purpose.
The address range depends on the SFR P4xAH, P4xAL and bits P4xC1,
P4xC0
P4xC1, P4xC0 Port 4 Chip-select Mode address comparison:
= 00: Compare the full address (16 bits length) with the base address registers
P4xAH and P4xAL.
= 01: Compare the 15 high bits (A15 − A1) of address bus with the base
address registers P4xAH and P4xAL.
= 10: Compare the 14 high bits (A15 − A2) of address bus with the base
address registers P4xAH and P4xAL.
= 11: Compare the 8 high bits (A15 − A8) of address bus with the base
address registers P4xAH and P4xAL.
P4.0 Base Address Low Byte Register
Bit:
7
6
5
4
3
2
1
0
A7
A6
A5
A4
A3
A2
A1
A0
Mnemonic: P40AL
Address: 94h
P4.0 Base Address High Byte Register
Bit:
7
6
5
4
3
2
1
0
A15 A14 A13 A12 A11 A10
A9
A8
Mnemonic: P40AH
Address: 95h
P4.1 Base Address Low Byte Register
Bit:
7
6
5
4
3
2
1
0
A7
A6
A5
A4
A3
A2
A1
A0
Mnemonic: P41AL
Address: 96h
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