R8CSLASH20 datasheet(413/501 Pages) RENESAS

413 / 501 page

R8C/20 Group, R8C/21 Group

19. Flash Memory

Rev.2.00 Aug 27, 2008

Page 397 of 458

REJ09B0250-0200

19.4.4

Status Registers

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 19.5 lists the Status Register Bits.

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.

19.4.4.1

Sequencer Status (Bits SR7 and FMR00)

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.

19.4.4.2

Erase Status (Bits SR5 and FMR07)

Refer to 19.4.5 Full Status Check.

19.4.4.3

Program Status (Bits SR4 and FMR06)

Refer to 19.4.5 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 19.5

Status Register Bits

Status

Bit

FMR0

Bit

Status Name

Description

Value

after

Reset

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

R8C/20 Datasheet(PDF) 413 Page - Renesas Technology Corp

R8C/20 Datasheet(HTML) 413 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL