R8C2K datasheet(408/471 Pages) RENESAS

408 / 471 page

R8C/2K Group, R8C/2L Group

20. Flash Memory

Rev.1.10

Dec 21, 2007

Page 391 of 450

REJ09B0406-0110

Figure 20.24

Program Flowchart during Erase-Suspend in EW1 Mode

20.4.4.3

EW1 Mode Interrupts

In EW1 mode, maskable interrupts can be used.

Table 20.6 lists the EW1 Mode Interrupts. Refer to 20.7.1.3 Non-Maskable Interrupts for details of the non-

maskable interrupt.

Table 20.6

EW1 Mode Interrupts

Status

When Maskable Interrupt Request is Acknowledged

During auto-erasure (erase-

suspend function enabled)

Auto-erasure is suspended after td(SR-SUS) and interrupt handling is executed.

Auto-erasure can be restarted by setting the FMR41 bit in theFMR4 register to 0

(erasure restarts) after interrupt handling completes.

During auto-erasure (erase-

suspend function disabled)

Auto-erasure has priority and the interrupt request acknowledgement is put on

standby. Interrupt handling is executed after auto-erasure completes.

During auto-programming

(program suspend function

enabled)

Auto-programming is suspended after td(SR-SUS) and interrupt

handling is executed. Auto-programming can be restarted by setting the FMR42 bit

in the FMR4 register to 0 (programming restarts) after interrupt handling completes.

During auto- programming

(program suspend function

disabled)

Auto-programming has priority and the interrupt request acknowledgement is put on

standby. Interrupt handling is executed after auto-programming completes.

Start

Write the command code 20h

Write D0h to any block

address

FMR00 = 1 ?

Full status check

Block erase completed

Yes

(EW1 Mode)

FMR40 = 1

NOTE:

1.td(SR-SUS) is needed until the interrupt request is acknowledged after it is generated. The interrupt to enter

suspend should be in interrupt enabled status.

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

I = 1 (enable interrupt)

FMR41 = 0

Maskable interrupt 1(1)

Write the command code 40h

to the write address

Write data to the write address

FMR44 = 0 ?

Full status check

REIT

Yes

Maskable interrupt 2(1)

REIT

Access flash memory

FMR42 = 0

I = 1 (enable interrupt)

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