M16CSLASH26 datasheet(222/239 Pages) RENESAS

222 / 239 page

Renesas Technology Corp.

Appendix Standard Serial I/O Mode 1 (Flash Memory Version)

216

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

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

outputs “8016”.

Table 1.22.3. Status register (SRD)

Sequencer status (SR7)

After power-on, the sequencer status is set to 1(ready).

The sequencer status indicates the operating status of the device. This status bit is set to “0” (busy)

during write or erase operation and is set to 1 upon completion of these operations.

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

Sequencer status

Reserved

Erase status

Program status

Reserved

Definition

“1”

“0”

Ready

Terminated in error

Busy

Terminated normally

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