23C256 Просмотр технического описания (PDF) - NEC => Renesas Technology
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23C256 Datasheet PDF : 32 Pages
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µPD23C256112A
Operation Commands
The following six operation settings are possible by inputting commands from I/O pins.
Command
HEX I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 I/O0
Read mode(1)
00H
L
L
L
L
L
L
L
L
Read mode(2)
01H
L
L
L
L
L
L
L
H
Read mode(3)Note1
50H
L
H
L
H
L
L
L
L
Reset Note2
FFH
H
H
H
H
H
H
H
H
Status read
ID read Note3
70H
L
H
H
H
L
L
L
L
90H
H
L
L
H
L
L
L
L
Command receivable
during Busy
Notes 1. The data output in read mode (3) is all FFH.
2. The only command that can be executed when the device is Busy is the reset command. Do not set any
of the other commands while the device is Busy.
3. For ID read, input “00H” during the first address cycle after setting a command.
I/O Pin Correspondence Table during Address Input Cycle (Address Setting)
(1) When 00H or 01H command is set [Read mode (1), Read mode (2)]
Command
I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 I/O0
1st address cycle
A7
A6
A5
A4
A3
A2
A1
A0
2nd address cycle
A16 A15 A14 A13 A12 A11 A10
A9
3rd address cycle
A24 A23 A22 A21 A20 A19 A18 A17
(2) When 50H command is set [Read mode (3)]
Command
1st address cycle
2nd address cycle
3rd address cycle
I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 I/O0
×
×
×
×
A3
A2
A1
A0
A16 A15 A14 A13 A12 A11 A10
A9
A24 A23 A22 A21 A20 A19 A18 A17
Remarks 1. A0 to A24 are internal addresses.
2. Internal address A8 is set internally with command 00H or 01H.
3. When 50H command is set [read mode (3)], the I/O4, I/O5, I/O6, and I/O7 inputs of the 1st address
cycle are VIH or VIL.
8
Data Sheet M15902EJ2V0DS
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