7641 datasheet(122/385 Pages) RENESAS

122 / 385 page

Rev.2.00

Aug 28, 2006

page 105 of 113

7641 Group

REJ09B0336-0200

HARDWARE

FLASH MEMORY MODE

qStatus Register 1 (SRD1)

The status register 1 indicates the status of serial communica-

tions, results from ID checks and results from check sum

comparisons. It can be read after the status register (SRD) by writ-

ing the read status register command (7016). Also, status register

1 is cleared by writing the clear status register command (5016).

Table 16 lists the definition of each status register 1 bit. This regis-

ter becomes “0016” when power is turned on and the flag status is

maintained even after the reset.

Table 16 Definition of each bit of status register 1 (SRD1)

Not verified

Verification mismatch

Reserved

Verified

SR15 (bit7)

SR14 (bit6)

SR13 (bit5)

SR12 (bit4)

SR11 (bit3)

SR10 (bit2)

SR9 (bit1)

SR8 (bit0)

Boot update completed bit

Reserved

Checksum match bit

ID code check completed bits

Data reception time out

Reserved

“1”

Update completed

Match

Time out

“0”

Not Update

Mismatch

Normal operation

Definition

SRD1 bits

Status name

•Boot update completed bit (SR15)

This flag indicates whether the control program was downloaded

to the RAM or not, using the download function.

•Check sum consistency bit (SR12)

This flag indicates whether the check sum matches or not when a

program, is downloaded for execution using the download func-

tion.

•ID code check completed bits (SR11 and SR10)

These flags indicate the result of ID code checks. Some com-

mands cannot be accepted without an ID code check.

•Data reception time out (SR9)

This flag indicates when a time out error is generated during data

reception. If this flag is attached during data reception, the re-

ceived data is discarded and the MCU returns to the command

wait state.

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