HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 262
HD6435348R
Manufacturer Part Number
HD6435348R
Description
Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6435348R.pdf
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Writing to RSTCSR: The RSTCSR must be written by moving word data to address H'FF14. It
cannot be written by byte access.
The upper byte of the word must contain a password. Separate passwords are used for clearing the
WRST bit and for writing a 1 or 0 to the RSTOE bit.
To clear the WRST bit, the word written at address H'FF14 must contain the password H'A5 in the
upper byte and the data H'00 in the lower byte. This clears the WRST bit to 0.
To set or clear the RSTOE bit, the word written at address H'FF14 must contain the password
H'5A in the upper byte and the write data in the lower byte. The value of bit 6 in the lower byte is
written in the RSTOE bit.
These write operations are illustrated in figure 13-3.
To write 0 to the WRST bit
To write to the RSTOE bit
Write to TCNT
Address
Write to TCSR
Address
Address
Address
Figure 13-2 Writing to TCNT and TCSR
Figure 13-3 Writing to RSTCSR
H'FFEC
H'FFEC
H'FF14
H'FF14
15
15
15
15
247
H'5A
H'A5
H'A5
H'5A
8 7
8 7
8 7
8 7
Write data
Write data
Write data
H'00
0
0
0
0
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