R8CSLASH15 datasheet(221/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

18. Flash Memory Version

Rev.2.10

Jan 19, 2006

Page 209 of 253

REJ09B0164-0210

18.4.4

Status Register

The status register indicates the operating status of the flash memory and whether an erasing or

programming operation completes normally or in error. Status of the status register can be read by

the FMR00, FMR06, and FMR07 bits in the FMR0 register.

Table 18.5 lists the Status Register.

In EW0 mode, the status register can be read in the following cases:

• When a given address in the user ROM area is read after writing the read status register

command

• When a given address in the user ROM area is read after executing the program or block erase

command but before executing the read array command.

18.4.4.1

Sequencer Status (SR7 and FMR00 Bits)

The sequencer status indicates operating status of the flash memory. SR7 = 0 (busy) during auto

programming and auto erasing, and is set to “1” (ready) at the same time the operation completes.

18.4.4.2

Erase Status (SR5 and FMR07 Bits)

Refer to 18.4.5 Full Status Check.

18.4.4.3

Program Status (SR4 and FMR06 Bits)

Refer to 18.4.5 Full Status Check.

• D0 to D7: Indicates the data bus which is read when the read status register command is executed.

• The FMR07 (SR5) to FMR06 bits (SR4) are set to “0” by executing the clear status register command.

• When the FMR07 bit (SR5) or FMR06 bit (SR4) is set to “1”, the program and block erase command

cannot be accepted.

Table 18.5

Status Register

Status

Bit

FMR0

Bit

Status Name

Contents

Value

after

Reset

“0”

“1”

SR0 (D0)

−

Reserved

−−

−

SR1 (D1)

−

Reserved

−−

−

SR2 (D2)

−

Reserved

−−

−

SR3 (D3)

−

Reserved

−−

−

SR4 (D4)

FMR06

Program status Completed

normally

Error

SR5 (D5)

FMR07

Erase status

Completed

normally

Error

SR6 (D6)

−

Reserved

−−

−

SR7 (D7)

FMR00

Sequencer

status

Busy

Ready

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