HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 418
HD6412340
Manufacturer Part Number
HD6412340
Description
H8S/2345 F-ZTAT Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6412340.pdf
(907 pages)
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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 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 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.
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.
Writing 0 to WOVF bit
Writing to RSTE and RSTS bits
Address: H'FFBE
Address: H'FFBE
Figure 11.3 Format of Data Written to RSTCSR
15
15
H'A5
H'5A
8 7
8 7
Write data
H'00
0
0
403
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