UPD75P3116 NEC, UPD75P3116 Datasheet - Page 29

• Manufacturer Part Number: UPD75P3116
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

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