UPD6P8 NEC [NEC], UPD6P8 Datasheet - Page 61

• Manufacturer Part Number: UPD6P8
• Description: MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC [NEC]

12.WRITING AND VERIFYING ONE-TIME PROM (PROGRAM MEMORY) ( µ PD6P8)
is used. Instead, the address is updated by using the clock input from the CLK pin.
12.1 Operating Mode When Writing/Verifying Program Memory
µ PD6P8 has been in the reset status (V
shown in Table 5-2 can be set by setting the MD
in Table 5-1 to GND via pull-down resistors.
V
V
CLK
MD
D
X
+10.5 V
PP
DD
IN
The program memory of the µ PD6P8 is a one-time PROM of 2026 × 10 bits.
To write or verify this one-time PROM, the pins shown in Table 5-1 are used. Note that no address input pin
0
The µ PD6P8 is set in the program memory write/verify mode when +10.5 V is applied to the V
×: don’t care (L or H)
, X
to D
V
0
PP
to MD
OUT
Pin Name
7
3
+3 V
V
DD
Setting of Operating Mode
Supplies voltage when writing/verifying program memory.
Apply +10.5 V to this pin.
Power supply.
Supply +3 V to this pin when writing/verifying program memory.
Inputs clock to update address when writing/verifying program memory.
By inputting a pulse four times to the CLK pin, the address of the program memory is updated.
Input to select the operation mode when writing/verifying program memory.
Inputs/outputs 8-bit data when writing/verifying program memory.
Clock necessary for writing program memory. Connect a 4 MHz ceramic resonator to this pin.
Table 12-1. Pins Used to Write/Verify Program Memory
MD
H
H
L
L
0
Table 12-2. Setting Operating Mode
MD
DD
H
L
L
×
1
= 3 V, V
Data Sheet U17848EJ3V0DS
0
through MD
PP
MD
H
H
H
H
= 0 V) for a specific time. In this mode, the operating modes
2
3
MD
pins. Connect all the pins other than those shown
H
H
H
L
Function
3
Clear program memory address to 0
Write mode
Verify mode
Program inhibit mode
µ PD6P8, 6P8A, 6P8B
Operating Mode
PP
pin after the
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