R8CSLASH2G datasheet(282/344 Pages) RENESAS

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R8C/2G Group

20. Flash Memory

Rev.1.00

Apr 04, 2008

Page 262 of 318

REJ09B0387-0100

20.4.4.1

Software Commands

There are four types of software commands:

• Read array

• Clear status register

• Program

• Block erase

Do not execute read status register command in EW1 mode.

Figure 20.13 shows Software Command Status Transition Diagram in EW1 Mode.

Figure 20.13

Software Command Status Transition Diagram in EW1 Mode

• Read Array Command

The read array command reads the flash memory.

When FFh is written to an address in the user ROM area, the MCU enters read array mode. In this mode,

the contents of the specified address can be read.

Read array mode continues until other commands are written. The MCU enters this mode after a reset is

deasserted.

• Clear Status Register Command

The clear status register command sets the status register to 0.

When 50h is written to an address in the user ROM area, bits FMR07 and FMR06 in the FMR0 register and

bits SR5 and SR4 in the status register are set to 00b.

Read array mode

(FMR46 = 1 Reading enabled)

Program

Block erase

Clear status

Auto-erasure

completed

Write 1 to the FMR01 bit immediately after writing 0, and

write 1 to the FMR11 bit immediately after writing 0.

FMR01 = 0

Read array mode

(FMR46 = 1 Reading enabled)

No command required

Reading only available

Auto-programming

completed

50h

(Clear status

command)

20h

(Block erase

command)

40h

(Program command)

Write data

(Programming starts)

FFh

(Read array

command)

D0h

(Block erasure starts)

CPU stops

Auto-erase

(FMR46 = 0 Reading disabled)

Auto-program

(FMR46 = 0 Reading disabled)

Clear ends

CPU rewrite mode (EW1 mode)

Reset

CPU rewrite disabled

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