NEC PD78078 用户手册

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PROM contents can be read onto the external data bus (D0 to D7) using the following procedure.

(1) Fix the RESET pin low, and supply +5 V to the V

PP

 pin.  Unused pins are handled as shown in, 1.5 (2) PROM

programming mode and 2.5 Pin Configuration (Top View).

(2) Supply +5 V to the V

DD

 and V

PP

 pins.

(3) Input address of data to be read to pins A0 through A16.

(4) Read mode.

(5) Output data to pins D0 through D7.

The timing for steps (2) through (5) above is shown in Figure 27-7.

Address Input

A0 to A16

CE (Input)

OE (Input)

D0 to D7

Hi-Z

Hi-Z

Data output