HD404374FT datasheet(111/161 Pages) RENESAS

111 / 161 page

HD404374/HD404384/HD404389/HD404082/HD404084 Series

Rev.5.00, Sep.11.2003, page 111 of 161

Notes:

1. When programming with a PROM writer, set up each ROM size to the address given in table 29. If it is

programmed erroneously to an address given in table 29 or later, check of writing of PROM may

become impossible. Particularly, caution should be exercised in the case of a plastic package since

reprogramming is impossible with it. Set the data in unused addresses to $FF.

2. If the indexes of the PROM writer socket, socket adapter and product are not aligned precisely, the

product may break down due to overcurrent. Be sure to check that they are properly set to the writer

before starting the writing process.

3. Two levels of program voltages (VPP) are available for the PROM: 12.5V and 21V. Our product

employs a VPP of 12.5V. If a voltage of 21V is applied, permanent breakdown of the product will

result. The VPP of 12.5V is obtained for the PROM writer by setting it according to the Intel 27258

specifications.

Table 27

Socket Adapters

Package

Model Name

Manufacturer

FP-30D

Please ask Renesas Technology

service section.

DP-28S

Please ask Renesas Technology

service section.

Writing/Verification

Programming of the built-in program ROM employs a high speed programming method. With this method,

high speed writing is effected without voltage stress to the device or without damaging the reliability of the

written data.

A basic programming flow chart is shown in figure 71 and a timing chart in figure 72.

For precautions for PROM writing procedure, refer to “Precautions for use of ZTAT

TM microcomputer with

build-in programmable ROM”.

Table 28

Selection of Mode

Mode

0 to O4

Writing

“Low”

“High”

Data input

Verification

“High”

“Low”

Data output

Prohibition of programming

“High”

High impedance

HD404374FT Datasheet(PDF) 111 Page - Renesas Technology Corp

HD404374FT Datasheet(HTML) 111 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL