M16CSLASH29 datasheet(367/499 Pages) RENESAS

367 / 499 page

20. Flash Memory Version

page 343

Figure 20.8 Setting and Resetting of EW Mode 0

Figure 20.9 Setting and Resetting of EW Mode 1

Execute the Read Array command (3)

Single-chip mode

Set CM0, CM1, and PM1 registers

(1)

Execute software commands

Jump to the rewrite control program transfered to an

internal RAM area (in the following steps, use the

rewrite control program internal RAM area)

Transfer a rewrite control program to internal RAM

area

Write 0 to the FMR01 bit

(CPU rewrite mode disabled)

Set the FMR01 bit to 1 after writing 0 (CPU

rewrite mode enabled) (2)

EW mode 0 operation procedure

Rewrite control program

Jump to a specified address in the flash memory

NOTES:

1. Select 10 MHz or below for CPU clock using the CM06 bit in the CM0 register and bits CM17 to 16 in the CM1

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 P85/NMI/SD pin is “H” at the time of the NMI function selected.

3. Disables the CPU rewrite mode after executing the read array command.

Single-chip mode

Set CM0, CM1, and PM1 registers (1)

Set the FMR01 bit to 1 (CPU rewrite mode

enabled) after writing 0

Set the FMR11 bit to 1 (EW mode 1) after writing

0 (2, 3)

Program in ROM

EW mode 1 operation procedure

Execute software commands

Set the FMR01 bit to 0

(CPU rewrite mode disabled)

NOTES:

1. Select 10 MHz or below for CPU clock using the CM06 bit in the CM0 register and bits CM17 to 16

in the CM1 register. Also, set the PM17 bit in the PM1 register to 1 (with wait state).

2. Set the FMR01 bits 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 the bit to 1. Set the FMR01 bit in a space other than

the internal flash memory. Set only when the P85/NMI/SD pin is “H” at the time of the NMI function

selected.

3. Set the FMR11 bit to 1 immediately after setting it to 0 while the FMR01 bit is set to 1. Do not

generate an interrupt or a DMA transfer between setting the FMR11 bit to 0 and setting it to 1.

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