M32CSLASH8B datasheet(399/406 Pages) RENESAS

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M32C/8B Group

25. Usage Notes

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 382 of 385

25.14.8 Boot Mode

When starting up in boot mode, input pins may not be placed in high-impedance states until the internal supply

voltage stabilizes. Use the following procedure to power up in boot mode.

(1) Input an “L” signal to the RESET pin and CNVSS pin

(2) Wait for td(P-R) (internal power supply stabilization time) or more after the voltage applied to the

VCC1 pin rises above 3.0 V

(3) Input an “L” (pull-down) to the P6_5 or an “H” (pull-up) to the P6_7

(4) Input an “L” (pull-down) to the EPM (P5_5) and an “H” (pull-up) to the CE (P5_0)

(5) Input an “H” to the CNVSS pin

(6) Input an “H” to the RESET pin (out of reset)

25.14.9 Writing Command and Data

Write command codes and data to even addresses in the user ROM area.

25.14.10 Block Erase

If an erase operation in progress is aborted due to such as the NMI interrupt, hardware reset, or supply voltage

drop, the lock bit or protect bit of the block which has been erased may become 0 (locked/protected). To erase

the same block again, set the FMR02 bit in the FMR0 register to 1 (lock bit disabled) and then execute the block

erase command.

25.14.11 Wait Mode

To enter wait mode, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled) and then execute

the WAIT instruction.

25.14.12 Stop Mode

To enter stop mode, use the following procedure:

• Set the FMR01 bit to 0 (CPU rewrite mode disabled) before setting the CM10 bit to 1 (stop mode).

• Execute the JMP.B instruction right after the instruction to set the CM10 bit to 1 (stop mode).

e.g.,

BSET

CM1

; Stop mode

JMP.B

L1:

Program after exiting stop mode

25.14.13 Low-Power Consumption Mode and On-Chip Oscillator Low-Power

Consumption Mode

When the CM05 bit in the CM0 register is set to 1 (main clock stopped), do not execute the following

commands:

• Program command

• Block erase command

• Lock bit program command

• Read lock bit status command

• Protect bit program command

• Read protect bit status command

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