M16CSLASH26 datasheet(195/239 Pages) RENESAS

195 / 239 page

CPU Rewrite Mode (Flash Memory Version)

189

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

EW1:

In EW1, program code is executed out of the FLASH. First FMR40 (SUSPEND_ENABLE) must be set

to allow the erase-suspend feature. After ther erase command is executed the CPU goes into HOLD.

A maskable interrupt will set FMR41 (SUSPEND_REQUEST) if in an erase operation. Once the erase

is suspended the HOLD is deasserted and execution from the FLASH continues. The interrupt routine

can now be servised, after which control is returned to the main program. If the

SUSPEND_REQUEST has been set, it should be cleared, and when the erase resumes the CPU

goes back into HOLD until the erase operation is complete or another interrupt occurs.

User actions:

1.0 Set FMR40

2.0 Execute erase command out of FLASH.

3.0 HOLD_POINT (in HOLD)

4.0 Maskable Interrupt request. (FMR41 set by h/w)

4.1 Access flash data/code.

4.2 Return

5.0 if FMR41 is set, clear FMR41, jump to HOLD_POINT.

6.0 Continue execution out of FLASH.

M16C/26 Datasheet(PDF) 195 Page - Renesas Technology Corp