23C256 Просмотр технического описания (PDF) - NEC => Renesas Technology
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23C256 Datasheet PDF : 32 Pages
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µPD23C256112A
Usage Cautions
(1) Rated operation
Operation using timing other than shown in the timing charts is not guaranteed.
(2) Commands that can be input
The only commands that can be input are 00H, 01H, 50H, 70H, 90H, and FFH. Do not input any other commands.
If other commands are input, the subsequent operation is not guaranteed.
(3) Command limitations during Busy period
Do not input commands other than the reset command (FFH) during the Busy period. If a command is input
during the Busy period, the subsequent operation is not guaranteed.
(4) Cautions regarding /RE clock
• Following the last /RE clock, do not input the /RE clock until the R, /B pin changes from Busy to Ready.
• Do not input the /RE clock other than during data output.
(5) Cautions upon power application
Since the state of the device is undetermined upon power on, input high level to the /CE pin and execute the reset
command following power on.
(6) Cautions during read mode
• Perform address input immediately following command input. If address input is done without performing
command input first, the correct data cannot be output because the operation mode is undetermined.
• To execute the read mode after the read mode has been stopped with the reset command (FFH) and /CE, input
again a command and address.
(7) Busy output following access of last address in page in read mode
After the access to the last address in a page, if the delay (tRHCH) from /RE to /CE is 30 ns or less, the Ready
status is maintained and Busy is not output by keeping /CE high level for a set period (tCEH).
/CE
tCEH
tRHCH
/RE
526
527
R, /B
Data Sheet M15902EJ2V0DS
9
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