Section 9 Timers
Rev. 6.00 Aug 04, 2006 page 315 of 680
REJ09B0145-0600
Bit 2:
Watchdog timer on (WDON)
Bit 2 enables watchdog timer operation.
Bit 2
WDON
Description
0
Watchdog timer operation is disabled
Clearing condition:
Reset, or when TCSRWE = 1 and 0 is written in both B2WI and
WDON
(initial value)
1
Watchdog timer operation is enabled
Setting condition:
When TCSRWE = 1 and 0 is written in B2WI and 1 is written in
WDON
Counting starts when this bit is set to 1, and stops when this bit is cleared to 0.
Bit 1:
Bit 0 write inhibit (B0WI)
Bit 1 controls the writing of data to bit 0 in TCSRW.
Bit 1
B0WI
Description
0
Bit 0 is write-enabled
1
Bit 0 is write-protected
(initial value)
This bit is always read as 1. Data written to this bit is not stored.
Bit 0:
Watchdog timer reset (WRST)
Bit 0 indicates that TCW has overflowed, generating an internal reset signal. The internal reset
signal generated by the overflow resets the entire chip. WRST is cleared to 0 by a reset from the
RES
pin, or when software writes 0.
Bit 0
WRST
Description
0
Clearing condition:
Reset by
RES
pin
When TCSRWE = 1, and 0 is written in both B0WI and WRST
1
Setting condition:
When TCW overflows and an internal reset signal is generated
Содержание H8/38342
Страница 8: ...Rev 6 00 Aug 04 2006 page vi of xxxvi...
Страница 12: ...Rev 6 00 Aug 04 2006 page x of xxxvi...
Страница 38: ...Rev 6 00 Aug 04 2006 page xxxvi of xxxvi...
Страница 76: ...Section 1 Overview Rev 6 00 Aug 04 2006 page 38 of 680 REJ09B0145 0600...
Страница 240: ...Section 7 RAM Rev 6 00 Aug 04 2006 page 202 of 680 REJ09B0145 0600...
Страница 468: ...Section 12 A D Converter Rev 6 00 Aug 04 2006 page 430 of 680 REJ09B0145 0600...
Страница 580: ...Section 15 Electrical Characteristics Rev 6 00 Aug 04 2006 page 542 of 680 REJ09B0145 0600...