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RSTCSR must be written to by a word transfer to address H'FF76. It cannot be written to with byte
instructions. Figure 12.7 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
Write to RSTE, 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 12.7 Format of Data Written to RSTCSR (Example of WDT0)
12.5.2
Contention between Timer Counter (TCNT) Write and Increment
If a timer counter clock pulse is generated during the T2 state of a TCNT write cycle, the write
takes priority and the timer counter is not incremented. Figure 12.8 shows this operation.
Содержание H8S/2215 Series
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