UPD6P9 datasheet(25/45 Pages) RENESAS

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µPD6P9

Data Sheet U15144EJ1V1DS

5. WRITING AND VERIFYING ONE-TIME PROM (PROGRAM MEMORY)

The program memory of the

µPD6P9 is a one-time PROM of 4074 × 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

is used. Instead, the address is updated by using the clock input from the CLK pin.

Table 5-1. Pins Used to Write/Verify Program Memory

Pin Name

Function

VPP

Supplies voltage when writing/verifying program memory.

Apply +12.5 V to this pin.

VDD

Power supply.

Supply +6 V to this pin when writing/verifying program memory.

CLK

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.

MD0 to MD3

Input to select the operation mode when writing/verifying program memory.

D0 to D7

Inputs/outputs 8-bit data when writing/verifying program memory.

XIN, XOUT

Clock necessary for writing program memory. Connect a 4 MHz ceramic resonator to this pin.

5.1 Operating Mode When Writing/Verifying Program Memory

The

µPD6P9 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

µPD6P9 has been in the reset status (VDD = 5 V, VPP = 0 V) for a specific time.

In this mode, the operating modes shown in Table 5-2 can be set by setting the MD0 through MD3 pins. Connect

all the pins other than those shown in Table 5-1 to GND via pull-down resistors.

Table 5-2. Setting Operating Mode

Setting of Operating Mode

Operating Mode

VPP

VDD

MD0

MD1

MD2

MD3

+12.5 V

+6 V

Clear program memory address to 0

HHH

Write mode

Verify mode

Program inhibit mode

×: don’t care (L or H)

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