M306H7MG-XXXFP Datasheet, PDF (288/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

M306H7MG-XXXFP/MC-XXXFP/FGFP
17. FLASH MEMORY VERSION
EW0 mode operation procedure
Single-chip mode, or boot mode
Rewrite control program
For only boot mode
set the FMR05 bit to “1” (user ROM area access)
Set CM0, CM1, and PM1 registers (Note 1)
Set the FMR01 bit by writing “0” and then “1”
(CPU rewrite mode enabled) (Note 2)
Transfer a rewrite control program to any area other
than the flash memory (Note 5)
Jump to the rewrite control program which has been
transferred to any area other than the flash memory
(The subsequent processing is executed by the
rewrite control program in any area other than the
flash memory)
Execute software commands
Execute the Read Array command (Note 3)
Write “0” to the FMR01 bit
(CPU rewrite mode disabled)
For only boot mode
Write “0” to the FMR05 bit (Boot ROM area
accessed) (Note 4)
Jump to a specified address in the flash memory
Note 1: Select 10 MHz or less for CPU clock using the CM0 register’s CM06 bit and CM1 register’s CM17 to 6
bits. Also, set the PM1 register’s PM17 bit to “1” (with wait state).
Note 2: To set the FMR01 bit to “1”, write “0” and then “1” in succession. Make sure no interrupts or no DMA
transfers will occur before writing “1” after writing “0”.
Write to the FMR01 bit from a program in other than the flash memory. Also write only when the NMI pin is
“H” level.
Note 3: Disables the CPU rewrite mode after executing the Read Array command.
Note 4: User ROM area is accessed when the FMR05 bit is set to “1”.
Note 5: When in CPU rewrite mode, bit 0 and bit 3 in the PM1 register are set to “1”. The rewrite control
program can only be executed in the internal RAM or in an external area that is enabled for use when the
PM13 bit = 1.
Figure 17.5 Setting and Resetting of EW0 Mode
Rev.2.10 Oct 25, 2006 Page 288 of 326
REJ03B0152-0210