UPD17P401 datasheet(21/32 Pages) NEC

Part #	UPD17P401

Description	ONE-TIME PROM VERSION 4-BIT SINGLE CHIP MICROCONTROLLER WITH DEDICATED ON-CHIP VCR CAMERA HARDWARE

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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21 / 32 page

µPD17P401

3.3

PROGRAM MEMORY READ PROCEDURE

(1) Unused pins are connected to GND with a pull-down resistor. The CLK pin is driven low.

(2) 5 V is supplied to the VDD pin. The VPP pin is driven low.

(3) 5 V is supplied to the VPP pin after a 10

µs wait.

(4) The mode setting pin is set to the program memory address zero-clear mode.

(5) 6 V is supplied to VDD, 12.5 V to VPP.

(6) Program inhibit mode.

(7) Verify mode. When clock pulses are input to the CLK pin, data is output sequentially, one address

per 4-input cycle.

(8) Program inhibit mode.

(9) Program memory address zero-clear mode.

(10) VDD/VPP pin voltage is changed to 5 V.

(11) Power OFF.

Steps (2) to (9) of this procedure are shown in the following Figure.

V PP

VDD

GND

+ 1

VDD

GND

VDD

CLK

D0-D7

MD0

MD1

MD2

MD3

Data Output

“L”

UPD17P401 Datasheet(PDF) 21 Page - NEC