M37517F8HP Datasheet, PDF (81/98 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7517 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 17 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 17 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 Aug 02, 2004 page 81 of 96