UPD78P368AKL-S 查看數據表（PDF） - NEC => Renesas Technology

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UPD78P368AKL-S

16/8 BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

mPD78P368A

A2 - A16

Fig. 4-2 PROM Write/Verify Timing Chart (Page Program Mode)

Page data latch

Page program

Program verify

Address input

A0, A1

Hi-Z

D0 - D7

+12.5 V

MODE0/ VPP

VDD

+6.5 V

VDD

VDD

CE (input)

Data input

Address input

Hi-Z

Data output

Hi-Z

PGM (input)

OE (input)

4.3 PROCEDURE FOR WRITING ON PROM (BYTE PROGRAM MODE)

The following is a procedure for writing on PROM. (See Fig. 4-3.)

(1) Always set each pin as follows: MODE0/VPP = H and MODE1 = L. Connect unused pins according to PIN

CONFIGURATION (2).

(2) Apply +6.5 V to the VDD pin and +12.5 V to the MODE0/VPP pin, and input a low-level signal to the CE pin.

(3) Input an initial address to the A0 to A16 pins.

(4) Input write data to the D0 to D7 pins.

(5) Input a 0.1 ms program pulse (active low) to the PGM pin.

(6) Verify mode. Checks if data has been written in PROM.

Input an active-low pulse to the OE pin and read the write data from the D0 to D7 pins.

• If data has been written, go to step (8).

• If not, repeat steps (4) to (6). If no data is written yet after the steps have been repeated 10 times, go to

step (7).

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

(8) Increment the address.

(9) Repeat steps (4) to (8) until the address exceeds the last address.

Fig. 4-4 is a timing chart of these steps (2) to (7).

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