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H8S/2214 数据表(PDF) 505 Page - Renesas Technology Corp

部件名 H8S/2214
功能描述  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  936 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8S/2214 数据表(HTML) 505 Page - Renesas Technology Corp

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Section 11 Watchdog Timer (WDT)
Rev.4.00 Sep. 18, 2008 Page 445 of 872
REJ09B0189-0400
(2) Writing to RSTCSR
RSTCSR must be written to by a word transfer to address H'FF76. It cannot be written to with
byte instructions.
Figure 11.3 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 upper byte of the written word must contain H'A5 and the lower
byte must contain H'00. 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.
Writing 0 to WOVF bit
Writing to RSTE and RSTS bits
Address: H'FF76
Address: H'FF76
H'A5
H'00
15
8 7
0
H'5A
Write data
15
8 7
0
Figure 11.3 Format of Data Written to RSTCSR (Example of WDT0)
(3) Reading TCNT, TCSR, and RSTCSR
These registers are read in the same way as other registers. The read addresses are H'FF74 for
TCSR, H'FF75 for TCNT, and H'FF77 for RSTCSR.



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