Register Descriptions - Hitachi H8/3937 Series Hardware Manual

3. Register configuration
Table 9-17 shows the register configuration of the watchdog timer.
Table 9-17 Watchdog Timer Registers
Name
Timer control/status register W
Timer counter W
Clock stop register 2
Port mode register 3
9.6.2

Register Descriptions

1. Timer control/status register W (TCSRW)
Bit
B6WI
Initial value
Read/Write
Note: * Write is permitted only under certain conditions, which are given in the descriptions of
the individual bits.
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 inhibit (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.
234
Abbrev.
TCSRW
TCW
CKSTP2
PMR3
7 6 5
TCWE B4WI
1 0 1
*
R R/W R
R/W Initial Value
R/W H'AA
R/W H'00
R/W H'FF
R/W H'00
4 3
TCSRWE B2WI WDON
0 1
*
R/W R R/W
Address
H'FFB2
H'FFB3
H'FFFB
H'FFCA
2 1 0
B0WI WRST
0 1 0
*
R R/W
(initial value)
*