Register Descriptions - Renesas H8 Series Hardware Manual

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 H8/38024R 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
*2
0 1 0/1
*1
R (R/W)
Rev. 7.00 Mar 10, 2005 page 303 of 652
Section 9 Timers
1 0
B0WI WRST
1 0
*1 *1
R (R/W)
(initial value)
(initial value)
REJ09B0042-0700