UPD75P048GC-AB8 Ver la hoja de datos (PDF) - NEC => Renesas Technology

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UPD75P048GC-AB8

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75P048

3.3 PROM READ PROCEDURE

The PROM contents can be read in the verify mode by using the following procedure: (see the following

figure)

(1) Pull unused pins to VSS through resistors. Set the X1 pin low.

(2) Supply 5 volts to the VDD and VPP pins.

(3) Wait for 10 µs.

(4) Select the clear program memory address mode.

(5) Supply 6 volts to the VDD and 12.5 volts to the VPP pins.

(6) Select the program inhibit mode.

(7) Select the verify mode. Apply four pulses to the X1 pin. Every four clock pulses will output the data stored

in one address.

(8) Select the program inhibit mode.

(9) Select the clear program memory address mode.

(10) Return the VDD and VPP pins back to + 5 volts.

(11) Turn off the power.

The following figure shows steps (2) to (9).

VPP

VPP

VDD

VDD+1

VDD

VDD

X1

P40-P43

P50-P53

Output data

Output data

MD0

(P30)

MD1

(P31)

“L”

MD2

(P32)

MD3

(P33)

16

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