hd64338342hw Renesas Electronics Corporation., hd64338342hw Datasheet - Page 626

• Manufacturer Part Number: hd64338342hw
• Description: Renesas 8-bit Single-chip Microcomputer H8 Family/h8/300l Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Appendix B Internal I/O Registers
TCSRW—Timer Control/Status Register W
Rev. 6.00 Aug 04, 2006 page 590 of 680
REJ09B0145-0600
Bit
Initial value
Read/Write
Bit 6 write inhibit
Note: * Write is permitted only under certain conditions.
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 bits 2 and 0
1
Bit 4 is write-protected
Bit 2 write inhibit
Data can be written to 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
WDON
R/(W)
H'B2
2
0
*
B0WI
R
1
1
Watchdog timer
WRST
R/(W)
0
0
*