upd6p9 Renesas Electronics Corporation., upd6p9 Datasheet - Page 24

• Manufacturer Part Number: upd6p9
• Description: 4-bit Single-chip Microcontroller For Infrared Remote Control Transmission
• Manufacturer: Renesas Electronics Corporation.

5.2 Program Memory Writing Procedure
24
V
V
PP
DD
The program memory is written at high speed by the following procedure.
(1) Pull down the pins not used to GND via a 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,
(11) Additional writing of (number of times of writing in (8) through (10): X) × 1 ms.
(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 the power.
The following figure illustrates steps (2) through (13) above.
D
0
V
GND
GND
to D
CLK
MD
MD
MD
MD
V
DD+1
V
repeat steps (8) through (10).
V
Reset
PP
DD
DD
Oscillation stabilization
7
0
1
2
3
wait time
Hi-Z
DD
and 12.5 V to V
DD
PP
Data input
pin after waiting for 10 µ s.
pin. Keep the V
Write
DD
Repeated X time
and V
PP
Hi-Z
Data Sheet U15144EJ1V1DS
.
PP
PP
pins to 5 V.
pin low.
Data output
Verify
Hi-Z
Additional write
Data input
IN
and X
increment
OUT
Address
Hi-Z
pins stabilizes.
µ PD6P9