2 prom write procedure – NEC uPD78P078 User Manual
Page 574
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574
CHAPTER 27
µ
PD78P078, 78P078Y
Start
Address = G
V
DD
= 6.5 V, V
PP
= 12.5 V
X = 0
Latch
Address = Address + 1
Latch
Address = Address + 1
Latch
Address = Address + 1
Latch
X = X + 1
0.1 ms program pulse
Verify 4 bytes
Pass
Address = N?
No
Pass
V
DD
= 4.5 to 5.5 V, V
PP
= V
DD
All bytes verified?
End of write
Address = Address + 1
No
Yes
X = 10 ?
Fail
Fail
Yes
All Pass
Defective product
G = Start address
N = Last address of program
27.3.2 PROM write procedure
Figure 27-3. Page Program Mode Flowchart
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