UPD6P8 datasheet(65/101 Pages) RENESAS

65 / 101 page

µPD6P8, 6P8A, 6P8B

Data Sheet U17848EJ5V0DS

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

µPD6P8)

The program memory of the

µPD6P8 is a one-time PROM of 2026 × 10 bits.

To write or verify this one-time PROM, the pins shown in Table 12-1 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 12-1. Pins Used to Write/Verify Program Memory

Pin Name

Function

VPP

Supplies voltage when writing/verifying program memory.

Apply +10.5 V to this pin.

VDD

Power supply.

Supply +3 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.

12.1 Operating Mode When Writing/Verifying Program Memory

The

µPD6P8 is set in the program memory write/verify mode when +10.5 V is applied to the VPP pin after the

µPD6P8 has been in the reset status (VDD = 3 V, VPP = 0 V) for a specific time. In this mode, the operating modes

shown in Table 12-2 can be set by setting the MD0 through MD3 pins. Connect all the pins other than those shown

in Table 12-1 to GND via pull-down resistors.

Table 12-2. Setting Operating Mode

Setting of Operating Mode

Operating Mode

VPP

VDD

MD0

MD1

MD2

MD3

+10.5 V

+3 V

Clear program memory address to 0

Write mode

Verify mode

Program inhibit mode

×: don’t care (L or H)

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