M32CSLASH8B datasheet(335/406 Pages) RENESAS

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Under development

M32C/8B Group

23. Flash Memory

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 318 of 385

23.6.1.2

Status Register

The Status Register can be read in EW0 mode. It indicates the operating status of the flash memory and whether

an erase or program operation has completed successfully or not. The Status Register value is reflected on bits

FMR00, FMR06, and FMR07 in the FMR0 register. After executing the read status register command, program

command, block erase command, lock bit program command, or protect bit program command, the flash

memory enters read status register mode and the Status Register returns its value by reading any even address in

the user ROM area. Table 23.6 shows the Status Register.

Table 23.6

Status Register

b7 to b0: These bits return the value of 8 low-order bits by reading an even address of the flash memory in 16-bit

units.

NOTE:

1. Bits FMR07 (SR5) and FMR06 (SR4) become 0 by executing the clear status register command. When the

FMR07 (SR5) or FMR06 (SR4) bit is 1, the program command, block erase command, lock bit program

command, read lock bit status command, and protect bit program command cannot be accepted by the flash

memory.

23.6.1.3

Error Check

To confirm whether the program command, block erase command, lock bit program command, or protect bit

program command is executed successfully, read bits FMR07 and FMR06 in the FMR0 register after each

operation is completed.

Table 23.7 lists error types and occurrence conditions. Figure 23.15 shows a flow chart of the error check and

handling procedure for each error.

Bit in

Status

Bit in

FMR0

Status Name

Description

Value after

Reset

SR0 (b0)

−

Reserved bit

−−

−

SR1 (b1)

−

Reserved bit

−−

−

SR2 (b2)

−

Reserved bit

−−

−

SR3 (b3)

−

Reserved bit

−−

−

SR4 (b4)

FMR06(1)

Program status

Successfully completed

Error

SR5 (b5)

FMR07(1)

Erase status

Successfully completed

Error

SR6 (b6)

−

Reserved bit

−−

−

SR7 (b7)

FMR00

Sequencer status

BUSY

READY

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