TCSRW—Timer Control/Status Register W
Bit
7
B6WI
Initial value
1
Read/Write
R
Bit 6 Write Inhibit
0
Bit 6 is write-enabled
1
Bit 6 is write-disabled
Notes: 1. Write is permitted only under certain conditions.
2. 1 on the H8/38124 Group.
6
5
TCWE
B4WI
0
1
R/(W) *
1
R
Timer Control/Status Register W Write Enable
0
1
Bit 4 Write Inhibit
0
Bit 4 is write-enabled
1
Bit 4 is write-disabled
Timer Counter W Write Enable
0
8-bit data cannot be written to TCW
1
8-bit data can be written to TCW
H'B2
4
3
TCSRWE
B2WI
0
1
R/(W) *
1
R
Watchdog Timer Reset
0
1
Bit 0 Write Inhibit
0
Bit 0 is write-enabled
1
Bit 0 is write-disabled
Watchdog Timer On
0
Watchdog timer operation is disabled
Clearing conditions:
Reset *
2
, or 0 is written in both B2WI and WDON
while TCSRWE = 1
1
Watchdog timer operation is enabled
Setting condition:
0 is written in B2WI and 1 is written in WDON
while TCSRWE = 1
Bit 2 Write Inhibit
0
Bit 2 is write-enabled
1
Bit 2 is write-disabled
Data cannot be written to bits 2 and 0
Data can be written to bits 2 and 0
Rev. 6.00, 08/04, page 555 of 628
Watchdog Timer
2
1
WDON
BOWI
WRST
0 *
2
1
R/(W) *
R/(W) *
1
R
Clearing conditions:
Reset by RES pin
When TCSRWE = 1, and 0 is written
in both B0WI and WRST
Setting condition:
When TCW overflows and an internal
reset signal is generated
0
0
1