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HD6432351 Datasheet(PDF) 573 Page - Renesas Technology Corp

Part # HD6432351
Description  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432351 Datasheet(HTML) 573 Page - Renesas Technology Corp

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Section 12 Watchdog Timer (WDT)
Rev. 3.00 Sep 15, 2006 page 539 of 988
REJ09B0330-0300
Writing to RSTCSR
RSTCSR must be written to by word transfer instruction to address H'FFBE. It cannot be written
to with byte instructions.
Figure 12.3 shows the format of data written to RSTCSR. The method of writing 0 to the WOVF
bit differs from that for writing to the RSTE and RSTS bits.
To write 0 to the WOVF bit, the write data must have H'A5 in the upper byte and H'00 in the
lower byte. This clears the WOVF bit to 0, but has no effect on the RSTE and RSTS bits. To write
to the RSTE and RSTS bits, the upper byte must contain H'5A and the lower byte must contain the
write data. This writes the values in bits 6 and 5 of the lower byte into the RSTE and RSTS bits,
but has no effect on the WOVF bit.
H'A5
H'00
15
8 7
0
H'5A
Write data
15
8 7
0
Writing 0 to WOVF bit
Writing to RSTE and RSTS bits
Address: H'FFBE
Address: H'FFBE
Figure 12.3 Format of Data Written to RSTCSR
Reading TCNT, TCSR, and RSTCSR
These registers are read in the same way as other registers. The read addresses are H'FFBC for
TCSR, H'FFBD for TCNT, and H'FFBF for RSTCSR.



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