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7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.19 Built-in PROM version

In contrast with the mask ROM version, a microcomputer incorporating a programmable ROM is called

built-in PROM version.

There are two types of built-in PROM version as shown below.

q One Time PROM version

Writing to the built-in PROM can be performed only once.

Neither erase nor rewrite operations are

enabled.

q Built-in EPROM version

The built-in EPROM version is a programmable microcomputer with window and can perform write,

erase, and rewrite operations.

The built-in PROM version has the EPROM mode for writing to the built-in PROM in addition to the same

functions as those of the mask ROM version.

For an outline of performance, a pin configuration and a functional block diagram of the built-in PROM

version, refer to “1.3 Performance overview”, “1.4 Pin configuration”, and “1.6 Functional block

diagram”, respectively.

The 7470/7471/7477/7478 group supports the built-in PROM versions shown in Table 1.19.1.

Product name

(P)ROM size

(bytes)

RAM size

(bytes)

I/O Ports

Package

Remarks

Table 1.19.1 7470/7471/7477/7478 group built-in PROM version supporting products

384

EPROM version

8192

192

16384

One Time PROM version

M37470E8-XXXSP

16384

384

M37470E4-XXXSP

8192

192

One Time PROM version

I/O ports: 28

(Including 8 analog

input pins.)

Input ports: 8

42P4B

56P6N-A

42P4B

56P6N-A

42S1B-A

I/O ports: 22

(Including 4 analog

input pins.)

Input ports: 4

32P4B

M37471E4-XXXSP

M37471E4-XXXFP

M37471E8-XXXSP

M37471E8-XXXFP

M37471E8SS

M37477E8-XXXSP

32P2W-A

32P4B

32P2W-A

One Time PROM version*

42P4B

56P6N-A

42P4B

56P6N-A

One Time PROM version

I/O ports: 20

Input ports: 16

(Including 8 analog

input pins.)

42S1B-A

EPROM version

384

16384

M37477E8-XXXFP

M37477E8TXXXSP

M37477E8TXXXFP

M37478E8-XXXFP

M37478E8TXXXSP

M37478E8TXXXFP

M37478E8-XXXSP

M37478E8SS

32P4B

One Time PROM version

16384

384

One Time PROM version*

I/O ports: 18

Input ports: 8

(Including 4 analog

input pins.)

(As of July, 1996)

*: Extended operating temperature version.

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