M16C62N Datasheet, PDF (193/213 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Mitsubishi microcomputers
M16C / 62N Group (80-pin)
Appendix Standard Serial I/O Mode 1 (Flash Memory Version) ^{SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER}
Status Register 1 (SRD1)
Status register 1 indicates the status of serial communications, results from ID checks and results from
check sum comparisons. It can be read after the SRD by writing the read status register command (7016).
Also, status register 1 is cleared by writing the clear status register command (5016).
Table 1.32.3 gives the definition of each status register 1 bit. “0016” is output when power is turned ON
and the flag status is maintained even after the reset.
Table 1.32.3. Status register 1 (SRD1)
SRD1 bits
SR15 (bit7)
SR14 (bit6)
SR13 (bit5)
SR12 (bit4)
SR11 (bit3)
SR10 (bit2)
Status name
Boot update completed bit
Flash identification value
Reserved
Check sum match bit
ID check completed bits
SR9 (bit1)
SR8 (bit0)
Data receive time out
Reserved
Definition
"1"
"0"
Update completed
Not update
HND
DINOR
-
-
Match
00
01
10
11
Mismatch
Not verified
Verification mismatch
Reserved
Verified
Time out
-
Normal operation
-
Boot Update Completed Bit (SR15)
This flag indicates whether the control program was downloaded to the RAM or not, using the down-
load function.
Flash Identification Value (SR14)
This flag indicates whether the flash memor type is HND or DINOR.
Check Sum Match Bit (SR12)
This flag indicates whether the check sum matches or not when a program, is downloaded for execu-
tion using the download function.
ID Check Completed Bits (SR11 and SR10)
These flags indicate the result of ID checks. Some commands cannot be accepted without an ID
check.
Data Receive 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 received data is discarded and the microcomputer returns to the command
wait state.
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