HD6473847RHV Datasheet, PDF (174/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 6 ROM
• Take care when setting the programming mode, as page programming is not supported.
• When programming with a PROM programmer, be sure to specify addresses from H'0000 to
H'3FFF. If programming is inadvertently performed from H'4000 onward, it may not be
possible to continue PROM programming and verification. When programming, H'FF should
be set as the data in address area H'4000 to H'1FFFF.
6.4 Reliability of Programmed Data
A highly effective way to improve data retention characteristics is to bake the programmed chips
at 150°C, then screen them for data errors. This procedure quickly eliminates chips with PROM
memory cells prone to early failure.
Figure 6.6 shows the recommended screening procedure.
Program chip and verify
programmed data
Bake chip for 24 to 48 hours at
125˚C to 150˚C with power off
Read and check program
Install
Figure 6.6 Recommended Screening Procedure
If a Group of programming errors occurs while the same PROM programmer is in use, stop
programming and check the PROM programmer and socket adapter for defects.
Please inform Renesas of any abnormal conditions noted during or after programming or in
screening of program data after high-temperature baking.
Rev. 7.00 Mar. 08, 2010 Page 142 of 510
REJ09B0024-0700