R8C14 Datasheet, PDF (215/277 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / R8C/Tiny SERIES

R8C/14 Group, R8C/15 Group
18. Flash Memory Version
Figure 18.8 shows the How to Set and Exit EW0 Mode. Figure 18.9 shows the How to Set and Exit
EW1 Mode.
EW0 Mode Operating Procedure
Set CM0 and CM1 registers⁽¹⁾
Transfer a rewrite control program which uses CPU
rewrite mode to any areas other than the flash
memory
Rewrite Control Program
Set the FMR01 bit by writing “0” and then “1”
(CPU rewrite mode enabled)⁽²⁾
Execute software commands
Execute the read array command⁽³⁾
Jump to the rewrite control program which has been
transferred to any areas other than the flash memory
(The subsequent process is executed by the rewrite
control program in any areas other than the flash
memory)
Write “0” to the FMR01 bit
(CPU rewrite mode disabled)
Jump to a specified address in the flash memory
NOTES :
1. Select 5MHz or below for the CPU clock by the CM06 bit in the CM0 register and the CM16 to CM17 bits in the CM1 register.
2. When setting the FMR01 bit to “1”, write “0” to the FMR01 bit before writing “1”. Do not generate an interrupt between writing “0” and
“1”.
3. Disable the CPU rewrite mode after executing the read array command.
Figure 18.8 How to Set and Exit EW0 Mode
EW1 Mode Operating Procedure
Program in ROM
Write “0” to the FMR01 bit before writing “1”
(CPU rewrite mode enabled)⁽¹⁾
Write “0” to the FMR11 bit before writing “1”
(EW1 mode)
Execute Software Commands
Write “0” to the FMR01 bit
(CPU rewrite mode disabled)
Figure 18.9
NOTES :
1. When setting the FMR01 bit to “1”, write “0” to the FMR01 bit before writing “1”.
Do not generate an interrupt between writing “0” and “1”.
How to Set and Exit EW1 Mode
Rev.2.10 Jan 19, 2006 Page 203 of 253
REJ09B0164-0210