UPD61P34BGS NEC, UPD61P34BGS Datasheet - Page 12

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

3. WRITING AND VERIFYING ONE-TIME PROM (PROGRAM MEMORY)
is used. Instead, the address is updated by using the clock input from the CLK pin.
3.1 Operating Mode When Writing/Verifying Program Memory
V is applied to the V
time. In this mode, the operating modes shown in Table 3-2 can be set by setting the MD
all the pins other than those shown in Table 3-1 to GND via pull-down resistor.
12
V
V
CLK
MD
D
X
+12.5 V
PP
DD
IN
The program memory of the PD61P34B is a one-time PROM of 1002
To write or verify this one-time PROM, the pins shown in Table 3-1 are used. Note that no address input pin
0
The PD61P34B is set in the program memory write/verify mode when +6 V is applied to the V
-D
, X
: don’t care (L or H)
V
0
-MD
PP
7
OUT
Pin Name
3
+6 V
V
DD
PP
pin after the PD61P34B has been in the reset status (V
Setting of Operating Mode
Supplies voltage when writing/verifying program memory.
Apply +12.5 V to this pin.
Power supply.
Supply +6 V to this pin when writing/verifying program memory.
Inputs clock to update address when writing/verifying program memory.
By inputting pulse four times to CLK pin, address of program memory is updated.
Input to select operation mode when writing/verifying program memory.
Inputs/outputs 8-bit data when writing/verifying program memory.
Clock necessary for writing program memory. Connect 500-kHz ceramic resonator to this pin.
MD
Table 3-1. Pins Used to Write/Verify Program Memory
H
H
L
L
0
Table 3-2. Setting Operation Mode
MD
H
L
L
1
Data Sheet U13595EJ2V0DS00
MD
H
H
H
H
2
MD
H
H
H
L
Function
3
Clear program address to 0
Write mode
Verify mode
Program inhibit mode
10 bits.
DD
= 5 V, V
Operation Mode
0
through MD
PP
= 0 V) for a specific
DD
3
pins. Connect
pin and +12.5
PD61P34B