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CHAPTER 22
µ
PD78P014, 78P014Y
498
22.2.2 PROM write procedure
PROM contents can be written using the following procedure and high-speed writing is enabled.
(1) Fix the RESET pin low, and 5 V to the V
PP
pin. Unused pins are handled as shown in 1.5 or 2.5 Pin
Configuration, (Top View), (2) PROM programming mode.
(2) 6 V to the V
DD
pin and +12.5 V to the V
PP
pin.
(3) Supply the initial address.
(4) Supply the written data.
(5) Supply the 1 ms program pulse (active low) to the CE pin.
(6) Verify mode. If written, proceed to step (8). If not written, repeat steps (4) through (6). If you repeat 25 times
and it can’t be written, proceed to (7).
(7) Stop the write operation as a defective device.
(8) Supply write data and repeat times from (4) through (6)
×
3 ms program pulse (additional write).
(9) Increment the address.
(10) Repeat steps (4) through (9) to the last address.
The timing for steps (2) through (8) above is shown Figure 22-2.
Figure 22-2. PROM Write/Verify Timing
A0 to A14
D0 to D7
+12.5 V
V
DD
CE (Input)
OE (Input)
V
DD
V
PP
V
DD
+6 V
Data Input
Data Output
Data Input
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Address Input
X-times Repeat
3Xms
Additional Write
Write
Verify
Summary of Contents for 78014Y Series
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