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9.6.2
Register Descriptions
Timer Control/Status Register W (TCSRW)
Bit
7
B6WI
Initial value
1
Read/Write
R
Notes: 1. Write is enabled only under certain conditions, which are given in the descriptions
of the individual bits.
2. Initial value is 0 on H8/38024, H8/38024S, and H8/38024F-ZTAT Group; initial value
is 1 on H8/38124 Group.
TCSRW is an 8-bit read/write register that controls write access to TCW and TCSRW itself,
controls watchdog timer operations, and indicates operating status.
Bit 7—Bit 6 Write Disable (B6WI)
Bit 7 controls the writing of data to bit 6 in TCSRW.
Bit 7
B6WI
Description
0
Bit 6 is write-enabled
1
Bit 6 is write-protected
This bit is always read as 1. Data written to this bit is not stored.
Bit 6—Timer Counter W Write Enable (TCWE)
Bit 6 controls the writing of data to TCW.
Bit 6
TCWE
Description
0
Data cannot be written to TCW
1
Data can be written to TCW
6
5
TCWE
B4WI
TCSRWE
0
1
*1
(R/W)
R
(R/W)
4
3
2
B2WI
WDON
0
1
0/1
*1
R
(R/W)
Rev. 6.00, 08/04, page 293 of 628
1
0
B0WI
WRST
*2
1
0
*1
R
(R/W)
(initial value)
(initial value)
*1
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