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參數(shù)資料
| 型號： | UPD78P368A |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8 BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 16 / 8位單片機(jī) |
| 文件頁數(shù)： | 18/52頁 |
| 文件大?。?/td> | 545K |
| 代理商： | UPD78P368A |
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18
m
PD78P368A
Fig. 4-2 PROM Write/Verify Timing Chart (Page Program Mode)
4.3 PROCEDURE FOR WRITING ON PROM (BYTE PROGRAM MODE)
The following is a procedure for writing on PROM. (See
Fig. 4-3
.)
(1)
Always set each pin as follows: MODE0/V
PP
= H and MODE1 = L. Connect unused pins according to PIN
CONFIGURATION (2).
Apply +6.5 V to the V
DD
pin and +12.5 V to the MODE0/V
PP
pin, and input a low-level signal to the CE pin.
Input an initial address to the A0 to A16 pins.
Input write data to the D0 to D7 pins.
Input a 0.1 ms program pulse (active low) to the PGM pin.
Verify mode. Checks if data has been written in PROM.
Input an active-low pulse to the OE pin and read the write data from the D0 to D7 pins.
If data has been written, go to step (8).
If not, repeat steps (4) to (6). If no data is written yet after the steps have been repeated 10 times, go to
step (7).
Assume the device to be defective and stop write operation.
Increment the address.
Repeat steps (4) to (8) until the address exceeds the last address.
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Fig. 4-4 is a timing chart of these steps (2) to (7).
Page data latch
Page program
Program verify
Address input
Address input
Data input
Data output
Hi-Z
Hi-Z
Hi-Z
A2 - A16
A0, A1
D0 - D7
+12.5 V
V
DD
MODE0/V
PP
+6.5 V
V
DD
V
DD
CE (input)
PGM (input)
OE (input)
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