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參數(shù)資料
| 型號： | UPD78P368AGF-3B9 |
| 廠商： | NEC Corp. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:56; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:25-4 RoHS Compliant: No |
| 中文描述： | 16 / 8位單片機(jī) |
| 文件頁數(shù)： | 16/52頁 |
| 文件大?。?/td> | 545K |
| 代理商： | UPD78P368AGF-3B9 |
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16
m
PD78P368A
4.2 PROCEDURE FOR WRITING ON PROM (PAGE PROGRAM MODE)
The following is a procedure for writing on PROM. (See
Fig. 4-1
.)
In the page program mode, data is written in units of pages (four bytes). When write data completes midway of
a page, latch FFH after the data so that the data fits into pages.
(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 V
PP
pin.
Input an initial address to the A0 to A16 pins.
Clear the page counter.
Data latch mode. Input write data to the D0 to D7 pins and input an active-low pulse to the OE pin. Increment
the address and the page counter.
Repeat step (5) for a page (four bytes).
Input a 0.1 ms program pulse (active low) to the PGM pin.
Verify mode. Checks if data has been written in PROM.
Apply a low level to the CE pin, input an active-low pulse to the OE pin, and then read the write data from the
D0 to D7 pins. Repeat this for a page (four bytes). When verification completes, apply a high level to the CE
pin.
If data has been written, go to step (10).
If not, repeat steps (7) and (8). If no data is written yet after the steps have been repeated 10 times, go to
step (9).
Assume the device to be defective and stop write operation.
(10) Increment the address.
(11) Repeat steps (4) to (10) until the address exceeds the last address.
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Fig. 4-2 is a timing chart of these steps (2) to (9).
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