7733 datasheet(513/940 Pages) RENESAS

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BUILT-IN PROM VERSION

7733 Group User’s Manual

19-7

(1) Read

___

When pins CE and OE are set to “L” level and an address is input to address input pins, the contents

___

of the built-in PROM can be read from data I/O pins; When pins CE and OE are set to “H” level, data

I/O pins enter the floating state.

(2) Program

___

When pin CE is set to “L” level, pin OE is set to “H” level, and VPP level is applied to pin VPP,

programming to the PROM can be performed.

Input an address to address input pins and supply data to be programmed to data I/O pins in 8-bit

____

parallel. On this condition, when pin PGM is set to “L” level, the data is programmed into the built-in

PROM.

(3) Erase (Available only in EPROM version)

The contents of the built-in PROM is erased by exposing the glass window on top of the package to

an ultraviolet light which has a wave length of 2537 Angstrom. The light must be 15 W•s/cm2 or more.

Table 19.1.4 I/O signals in EPROM mode

Pin name

Data I/O

Output

Floating

Input

Output

Floating

VIL

VIH

VIL

VIH

VIL

VIH

VIL

VIH

VIL

VIH

5 V

12.5 V

Vcc

VPP

PGM

5 V

6 V

19.1 EPROM mode

X : It may be VIL or VIH.

Mode

Read-out

Output

disable

Program

Program verify

Program disable

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