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M16C/29 Group
EW0 mode operation procedure
Set CM0, CM1, and PM1 registers (Note 1)
Transfer a rewrite control program to internal RAM
area
Jump to the rewrite control program transfered to an
internal RAM area (in the following steps, use the
rewrite control program internal RAM area)
Note 1: Select 10 MHz or below for CPU clock using the CM06 bit in the CM0 register and CM17 to 16 bits in the
CM1 register. Also, set the PM17 bit in the PM1 register to "1" (with wait state).
Note 2: Set the FMR01 bit to "1" immediately after setting it to "0". Do not generate an interrupt or a DMA transfer
between setting the bit to "0" and setting it to "1". Set the FMR01 bit in a space other than the internal flash
memory. Also, set only when the P8
Note 3: Disables the CPU rewrite mode after executing the read array command.
Figure 21.5.1.1. Setting and Resetting of EW0 Mode
Note 1: In EW1 mode, do not set boot mode.
Note 2: Select 10 MHz or below for CPU clock using the CM06 bit in the CM0 register and CM17 to 16
Note 3: Set the FMR01 bits to "1" immediately after setting it to "0". Do not generate an interrupt or a DMA
Figure 21.5.1.2. Setting and Resetting of EW1 Mode
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
Single-chip mode
/NMI/SD pin is "H" at the time of the NMI function selected.
5
EW1 mode operation procedure
Program in ROM
Single-chip mode (Note 1)
Set CM0, CM1, and PM1 registers (Note 2)
Set the FMR01 bit to "1" (CPU rewrite mode
enabled) after writing "0"
Set the FMR11 bit to "1" (EW1 mode) after writing
"0" (Note 3)
Execute software commands
Set the FMR01 bit to "0"
(CPU rewrite mode disabled)
bits. in the CM1 register. Also, set the PM17 bit in the PM1 register to "1" (with wait state).
transfer between setting the bit to "0" and setting the bit to "1". Set the FMR01 bit in a space other
than the internal flash memory. Set only when the P8
function selected.
page 378 of 402
Rewrite control program
Set the FMR01 bit to "1" after writing "0" (
CPU rewrite mode enabled) (Note 2)
Execute software commands
Execute the Read Array command (Note 3)
Write "0" to the FMR01 bit
(CPU rewrite mode disabled)
Jump to a specified address in the flash memory
/NMI/SD pin is "H" at the time of the NMI
5
21. Flash Memory Version
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