UPD78P328CW データシートの表示（PDF） - NEC => Renesas Technology

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UPD78P328CW

16/8-BIT SINGLE-CHIP MICROCONTROLLER

NEC => Renesas Technology 

µPD78P328

3.2 PROM Write Procedure

The write procedure into PROM is as follows: (See also Figure 3-2).

(1) Fix RESET = H and AVDD = L. Connect other unused pins exactly as indicated in section "Pin Configuration."

(2) Supply +6 V to the VDD and +12.5 V to the VPP pin.

(3) Supply an initial address.

(4) Supply write data.

(5) Supply 1 ms program pulse (active low) to the CE pin.

(6) Execute the verify mode. Check whether or not the write data is written normally.

• When it is written normally: Proceed to step (8).

• When it is not written normally: Repeat steps (4) to (6).

If the data is not written normally after 25 repetitions of the steps, proceed to step (7).

(7) Assume the device to be defective. Stop write operation.

(8) Supply write data and X (number of steps (4) to (6) repetitions) x 3 ms program pulses (additional write).

(9) Increment the address.

(10) Repeat steps (4) to (9) to the last address.

Figure 3-1 shows the PROM Write/Verify Timing Steps (2) to (8) above.

Figure 3-1. PROM Write/Verify Timing

A0-A14

D0-D7

+12.5 V

VPP

VDD

+6 V

VDD

VDD

CE (input)

X-time repetition

Write

Verify

Address input

Additional

data write

Data input

Hi-Z

Data

output

Hi-Z

Data input

Hi-Z

3 X ms

OE (input)

16

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