R8C2K datasheet(399/471 Pages) RENESAS

399 / 471 page

R8C/2K Group, R8C/2L Group

20. Flash Memory

Rev.1.10

Dec 21, 2007

Page 382 of 450

REJ09B0406-0110

Figure 20.16 shows the Program Flowchart during Erase-Suspend in EW0 Mode.

Figure 20.16

Program Flowchart during Erase-Suspend in EW0 Mode

Start

Write the command code 20h

Write D0h to any block

address

FMR00 = 1 ?

Full status check

Block erase completed

Yes

(EW0 Mode)

FMR40 = 1

NOTES:

1. In EW0 mode, the interrupt vector table and interrupt routine for interrupts to be used should be allocated to the RAM area.

2. When no interrupt is used, the instruction to enable interrupts is not needed.

3. td(SR-SUS) is needed until erase or program is suspended after the FMR41 bit or the FMR42 bit in the FMR4 register is set to 1.

Maskable interrupt 1: interrupt in erase-suspend, maskable interrupt 2: interrupt in program-suspend

Maskable interrupt 1(1)

FMR44 = 0 ?

REIT

Yes

I = 1 (enable interrupt)(2)

FMR41 = 0

FMR43 = 1 ?

FMR46 = 1 ?

Yes

I = 1 (enable interrupt)(2)

FMR41 = 1(3)

Yes

Maskable interrupt 2(1)

REIT

Yes

FMR42 = 0

Access flash memory

FMR44 = 1 ?

FMR46 = 1 ?

Access flash memory

FMR42 = 1(3)

Yes

Write the command code 40h to

the write address

Write data to the write address

Full status check

FMR44 = 0 ?

I = 1 (enable interrupt)(2)

Write the command code 40h to

the write address

Write data to the write address

Yes

Full status check

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