M37516E3-XXXHP データシートの表示（PDF） - Renesas Electronics

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M37516E3-XXXHP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Renesas Electronics 

7516 Group

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 19 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.

•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 check completed bits (SR11 and SR10)

These flags indicate the result of ID checks. Some commands

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.

Table 19 Definition of each bit of status register 1 (SRD1)

SRD1 bits

Status name

SR15 (bit7)

SR14 (bit6)

SR13 (bit5)

SR12 (bit4)

SR11 (bit3)

SR10 (bit2)

Boot update completed bit

Reserved

Reserved

Checksum match bit

ID check completed bits

SR9 (bit1)

SR8 (bit0)

Data reception time out

Reserved

Definition

“1”

“0”

Update completed

Not Update

-

-

-

-

Match

00

Mismatch

Not verified

01

Verification mismatch

10

Reserved

11

Verified

Time out

Normal operation

-

-

Rev.1.01 Jul 01, 2003 page 72 of 89

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