3 program memory read procedure – NEC uPD75P3116 User Manual
Page 30
µ
PD75P3116
30
Data Sheet U11369EJ3V0DS
V
PP
V
DD
V
DD
+ 1
V
DD
V
PP
V
DD
X1
Data output
Data output
MD0/P30
MD2/P32
MD3/P33
MD1/P31
“L”
D0/P60 to D3/P63
D4/P50 to D7/P53
8.3 Program Memory Read Procedure
The
µ
PD75P3116 can read program memory contents using the following procedure.
(1)
Pull down unused pins to V
SS
via resistors. Set the X1 pin to low.
(2)
Supply 5 V to the V
DD
and V
PP
pins.
(3)
Wait 10
µ
s.
(4)
Select the program memory address zero-clear mode.
(5)
Supply 6 V to V
DD
and 12.5 V to V
PP
.
(6)
Select the verify mode. Apply four pulses to the X1 pin. The data stored in one address will be output every four
clock pulses.
(7)
Select the program memory address zero-clear mode.
(8)
Return the V
DD
- and V
PP
-pin voltages to 5 V.
(9)
Turn off the power.
The following figure shows steps (2) to (7).