PD17P246_15 Datasheet, PDF (16/34 Pages) Renesas Technology Corp – PD17P246_15 FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROLLER

µPD17P246
3. WRITING AND VERIFYING ONE-TIME PROM (PROGRAM MEMORY)
The program memory of the µPD17P246 is one-time PROM of 16,384 × 16 bits.
To write or verify this one-time PROM, the pins shown in Table 3-1 are used. Note that no address input pin
is used. Instead, the address is updated by using the clock input from the CLK pin.
Table 3-1. Pins Used to Write/Verify Program Memory
Pin Name
VPP
VDD
CLK
MD0 to MD3
D0 to D7
Function
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 operating mode when writing/verifying program memory.
Inputs/outputs 8-bit data when writing/verifying program memory.
3.1 Operating Mode When Writing/Verifying Program Memory
The µPD17P246 is set in the program memory write/verify mode when +6 V is applied to the VDD pin and
+12.5 V is applied to the VPP pin after the µPD17P246 has been in the reset status (VDD = 5 V, RESET = 0 V) for
a specific time. In this mode, the operating modes shown in Table 3-2 can be set by setting the MD0 to MD3 pins.
Leave all the pins other than those shown in Table 3-1 unconnected or connect them to GND via a pull-down resistor
(470 Ω). (See PIN CONFIGURATION (2) PROM programming mode.)
Table 3-2. Setting Operating Mode
VPP
+12.5 V
VDD
+6 V
Setting of Operating Mode
MD0
MD1
H
L
L
H
L
L
H
×
MD2
H
H
H
H
×: don’t care (L or H)
Operating Mode
MD3
L
Program memory address 0 clear mode
H
Write mode
H
Verify mode
H
Program inhibit mode
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Data Sheet U15215EJ1V0DS