HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 454

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

TCSRW—Timer control/status register W
450
Bit
Initial value
Read/Write
Note: * Write is permitted only under certain conditions.
Bit 6 write inhibit
0 Bit 6 is write-enabled
1
Timer counter W write enable
0 Data cannot be written to TCW
1
Bit 6 is write-protected
Bit 4 write inhibit
Data can be written to TCW
0 Bit 4 is write-enabled
1
Timer control/status register W write enable
0 Data cannot be written to TCSRW bits 2 and 0
1
Bit 4 is write-protected
Bit 2 write inhibit
Data can be written to TCSRW bits 2 and 0
0 Bit 2 is write-enabled
1
B6WI
Watchdog timer on
Bit 2 is write-protected
0 Watchdog timer operation is disabled
1
R
7
1
Bit 0 write inhibit
0 Bit 0 is write-enabled
1
Watchdog timer operation is enabled
Watchdog timer reset
0 [Clearing conditions]
1 [Setting condition]
Bit 0 is write-protected
TCWE
R/(W)
• Reset by RES pin
• When TCSRWE = 1, and 0 is written in both B0WI and WRST
When TCW overflows and a reset signal is generated
6
0
*
B4WI
R
5
1
TCSRWE
R/(W)
4
0
*
B2WI
R
3
1
H'FFBE
WDON
R/(W)
2
0
*
B0WI
R
Watchdog timer
1
1
WRST
R/(W)
0
0
*