UPD61P34BGS NEC, UPD61P34BGS Datasheet - Page 13

• Manufacturer Part Number: UPD61P34BGS
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

3.2 Program Memory Writing Procedure
V
V
PP
DD
The program memory is written at high speed in the following procedure.
(1) Pull down the pins not used to GND via resistor. Keep the CLK pin low.
(2) Supply 5 V to the V
(3) Supply 5 V to the V
(4) Wait for 2 ms until oscillation of the ceramic resonator connected across the X
(5) Set the program memory address 0 clear mode by using the mode setting pins.
(6) Supply 6 V to V
(7) Set the program inhibit mode.
(8) Write data to the program memory in the 1-ms write mode.
(9) Set the program inhibit mode.
(10) Set the verify mode. If the data have been written to the program memory, proceed to (11). If not, repeat
(11) Additional writing of (number of times of writing in (8) through (10): X)
(12) Set the program inhibit mode.
(13) Input a pulse to the CLK pin four times to update the program memory address (+1).
(14) Repeat steps (8) through (13) up to the last address.
(15) Set the 0 clear mode of the program memory address.
(16) Change the voltages on the V
(17) Turn off power.
The following figure illustrates steps (2) through (13) above.
D
V
GND
GND
CLK
MD
MD
MD
MD
0
DD+1
V
V
V
-D
steps (8) through (10).
Reset
DD
DD
PP
7
0
1
2
3
Oscillation stabilization
wait time
Hi-Z
DD
and 12.5 V to V
DD
PP
Data input
pin after waiting for 10 s.
pin. Keep the V
Write
Repeated X time
DD
and V
PP
Hi-Z
Data Sheet U13595EJ2V0DS00
.
PP
PP
Data output
pins to 5 V.
pin low.
Verify
Hi-Z
Additional write
Data input
1 ms.
IN
and X
increment
Address
OUT
PD61P34B
Hi-Z
pins stabilizes.
13