M37517F8HP Datasheet, PDF (61/98 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7517 Group
Start
Single-chip mode or Boot mode
Set CPU mode register (Note 1)
Transfer CPU rewrite mode control program
to RAM
Jump to control program transferred in RAM
(Subsequent operations are executed by control
program in this RAM)
Set CPU rewrite mode select bit to “1” (by
writing “0” and then “1” in succession)
Using software command execute erase,
program, or other operation
Execute read array command or reset flash
memory by setting flash memory reset bit (by
writing “1” and then “0” in succession) (Note 2)
Write “0” to CPU rewrite mode select bit
End
Notes 1: Set bits 6, 7 (main clock division ratio selection bits) of CPU mode register (003B16).
2: Before exiting the CPU rewrite mode after completing erase or program operation,
always be sure to execute the read array command or reset the flash memory.
Fig. 66 CPU rewrite mode set/release flowchart
Rev.1.01 Aug 02, 2004 page 61 of 96