M16CSLASH62 datasheet(282/621 Pages) RENESAS

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Appendix Standard Serial I/O Mode (Flash Memory Version)

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

267

Status Register (SRD)

The status register indicates operating status of the flash memory and status such as whether an erase

operation or a program ended successfully or in error. It can be read by writing the read status register

command (7016). Also, the status register is cleared by writing the clear status register command (5016).

Table 1.31.2 gives the definition of each status register bit. After clearing the reset, the status register

outputs “8016”.

Table 1.31.2. Status register (SRD)

Write State Machine (WSM) Status (SR7)

The write state machine (WSM) status indicates the operating status of the flash memory. When

power is turned on, “1” (ready) is set for it. The bit is set to “0” (busy) during an auto write or auto erase

operation, but it is set back to “1” when the operation ends.

Erase Status (SR5)

The erase status reports the operating status of the auto erase operation. If an erase error occurs, it is

set to “1”. When the erase status is cleared, it is set to “0”.

Program Status (SR4)

The program status reports the operating status of the auto write operation. If a write error occurs, it is

set to “1”. When the program status is cleared, it is set to “0”.

SRD0 bits

SR7 (bit7)

SR6 (bit6)

SR5 (bit5)

SR4 (bit4)

SR3 (bit3)

SR2 (bit2)

SR1 (bit1)

SR0 (bit0)

Status name

Write state machine (WSM) status

Reserved

Erase status

Program status

Block status after program

Reserved

Definition

"1"

"0"

Ready

Terminated in error

Busy

Terminated normally

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