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參數(shù)資料
| 型號： | μPD78P048A |
| 廠商： | NEC Corp. |
| 英文描述： | 8 Bit Single Chip Microcontrollers(8位單片微控制器) |
| 中文描述： | 8位單片機(jī)微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 22/72頁 |
| 文件大小： | 387K |
| 代理商： | ΜPD78P048A |
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m
PD78P048A
22
(1) Read mode
Read mode is set if CE = L, OE = L is set.
(2) Output disable mode
Data output becomes high-impedance, and is in the output disable mode, if OE = H is set.
Therefore, it allows data to be read from any device by controlling the OE pin, if multiple
m
PD78P048As are
connected to the data bus.
(3) Standby mode
Standby mode is set if CE = H is set.
In this mode, data outputs become high-impedance irrespective of the OE status.
(4) Page data latch mode
Page data latch mode is set if CE = H, PGM = H, OE = L are set at the beginning of page write mode.
In this mode, 1 page 4-byte data is latched in an internal address/data latch circuit.
(5) Page write mode
After 1 page 4 bytes of addresses and data are latched in the page data latch mode, a page write is executed
by applying a 0.1 ms program pulse (active low) to the PGM pin with CE = H, OE = H. Then, program verification
can be performed, if CE = L, OE = L are set.
If programming is not performed by a one-time program pulse, X (X - 10) write and verification operations
should be executed repeatedly.
(6) Byte write mode
Byte write is executed when a 0.1 ms program pulse (active low) is applied to the PGM pin with CE = L, OE
= H. Then, program verification can be performed if OE = L is set.
If programming is not performed by a one-time program pulse, X (X - 10) write and verification operations
should be executed repeatedly.
(7) Program verify mode
Program verify mode is set if CE = L, PGM = H, OE = L are set.
In this mode, check if a write operation is performed correctly, after the write.
(8) Program inhibit mode
Program inhibit mode is used when the OE pin, V
PP
pin and D0 to D7 pins of multiple
m
PD78P048As are
connected in parallel and a write is performed to one of those devices.
When a write operation is performed, the page write mode or byte write mode described above is used. At
this time, a write is not performed to a device which has the PGM pin driven high.
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