4553 datasheet(140/145 Pages) RENESAS

140 / 145 page

Rev.3.02

Dec 22, 2006

page 140 of 142

REJ03B0024-0302

4553 Group

Table 19 Product of built-in PROM version

PROM size

(✕ 10 bits)

8192 words

RAM size

(✕ 4 bits)

288 words

M34553G8FP

M34553G8HFP

One Time PROM [shipped in blank]

PLQP0048KB-A

BUILT-IN PROM VERSION

In addition to the mask ROM versions, the 4553 Group has the

One Time PROM versions whose PROMs can only be written to

and not be erased.

The built-in PROM version has functions similar to those of the

mask ROM versions, but it has PROM mode that enables writing to

built-in PROM.

(1) PROM mode

The 4553 Group has a PROM mode in addition to a normal opera-

tion mode. It has a function to serially input/output the command

codes, addresses, and data required for operation (e.g., read and

program) on the built-in PROM using only a few pins. This mode

can be selected by muddog entry after powering on the VDD pin.

In the PROM mode, three types of software commands (read, pro-

gram, and program verify) can be used. Clock-synchronous serial

I/O is used, beginning from the LSB (LSB first).

(2) Notes on handling

➀ For the One Time PROM version shipped in blank, Renesas

corp. does not perform PROM writing test and screening in the

assembly process and following processes. In order to improve

reliability after writing, performing writing and test according to

the flow shown in Figure 60 before using is recommended (Prod-

ucts shipped in blank: PROM contents is not written in factory

when shipped).

(3) Difference between Mask ROM version and

One Time PROM version

Mask ROM version and One Time PROM version have some dif-

ference of the following characteristics within the limits of an

electrical property by difference of a manufacture process, built-

in ROM, and a layout pattern.

• a characteristic value

• a margin of operation

• the amount of noise-proof

• noise radiation, etc.,

Accordingly, be careful of them when swithcing.

Fig. 68 Flow of writing and test of the product shipped in blank

ROM type

Package

Part number

Table 19 shows the product of built-in PROM version. Figure 61

shows the pin configurations of built-in PROM versions.

The One Time PROM version has pin-compatibility with the mask

ROM version.

Writing with PROM programmer

Screening (Leave at 150

°C for 40 hours) (Note)

Verify test with PROM programmer

Function test in target device

Since the screening temperature is higher

than storage temperature, never expose the

microcomputer to 150

°C exceeding 100

hours.

Note:

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