R8C2K datasheet(392/471 Pages) RENESAS

392 / 471 page

R8C/2K Group, R8C/2L Group

20. Flash Memory

Rev.1.10

Dec 21, 2007

Page 375 of 450

REJ09B0406-0110

20.4.3.1

Software Commands

There are five types of software commands:

• Read array

• Read status register

• Clear status register

• Program

• Block erase

Figure 20.9 shows the Software Command Status Transition Diagram in EW0 Mode.

Figure 20.9

Software Command Status Transition Diagram in EW0 Mode

Read array mode

(FMR46 = 1

Reading enabled)

Program

Read status

Block erase

Erase

suspend

Clear status

Program

suspend

Auto-erasure completed

Non-D0h

and

non-FFh

Write 1 to the FMR01 bit immediately after writing 0.

FMR01 = 0

CPU rewrite mode (EW0 mode)

Read array mode

(FMR46 = 1

Reading enabled)

No command required

Reading only available

Auto-programming completed

50h

(Clear status

20h

(Block erase

command)

FFh

(Read array

command)

70h

(Read status

command)

40h

(Program command)

Write data

(Programming starts)

FFh

(Read array

command)

D0h

(Block erasure starts)

Auto-erase

(FMR46 = 0

Reading disabled)

Auto-program

(FMR46 = 0

Reading disabled)

Clear ends

Reset

CPU rewrite disabled

FMR41 = 0

(Restart)

FMR41 = 1

(Suspend request)

FMR42 = 1

(Suspend request)

FMR42 = 0

(Restart)

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