609
TCNT—Timer Counter
H'A9 (read),
WDT
H'A8 (write)
Bit
Initial value
Read/Write
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
0
0
R/W
2
0
R/W
1
0
R/W
Count value
RSTCSR—Reset Control/Status Register
H'AB (read),
WDT
H'AA (write)
Bit
Initial value
Read/Write
7
WRST
0
R/(W)
6
RSTOE
0
R/W
5
—
1
—
4
—
1
—
3
—
1
—
0
—
1
—
2
—
1
—
1
—
1
—
Reset output enable
0
Reset signal is not output externally
1
Reset signal is output externally
Watchdog timer reset
0
[Clearing condition]
Reset signal input at RES pin, or 0 written by software
1
[Setting condition]
TCNT overflow generates a reset signal
Note:
*
Only 0 can be written in bit 7 to clear the flag.
*