HD64F38602R Datasheet, PDF (148/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 6 ROM
6.7 Notes on Setting Module Standby Mode
When the flash memory is set to enter the module standby mode, the system clock supply is
stopped to the module, the function is stopped, and the state is the same as that in standby mode.
Also programming is stopped in the flash memory. Therefore operation program should be
transferred to the RAM and the program should run in the RAM. Then the flash memory should
be set to enter the module standby mode.
If an interrupt is generated in module standby mode, the vector address cannot be fetched. As a
result, the program may run away.
Before the flash memory is set to enter module standby mode, the corresponding bit in the
interrupt enable register should be cleared to 0 and the I bit in CCR should be set to 1. Then after
the flash memory enters the module standby mode, the NMI interrupt request should not be
generated.
Transfer execution program
to RAM (user area)
Clear corresponding bit in
interrupt enable register to 0
Set I bit in CCR to 1
Jump to address of
execution program in RAM
Clear FROMCKSTP
bit in CRSTPR1 to 0
Figure 6.5 Module Standby Mode Setting
Rev. 3.00 May 15, 2007 Page 116 of 516
REJ09B0152-0300