HD6433935 Hitachi, HD6433935 Datasheet - Page 246

• Manufacturer Part Number: HD6433935
• Description: 8-Bit MICROCONTROLLER
• Manufacturer: Hitachi

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
1. Timer control/status register W (TCSRW)
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
0
1
This bit is always read as 1. Data written to this bit is not stored.
234
Bit
Initial value
Read/Write
Note: *
Register Descriptions
Write is permitted only under certain conditions, which are given in the descriptions of
the individual bits.
Description
Bit 6 is write-enabled
Bit 6 is write-protected
B6WI
R
7
1
TCWE
R/W
6
0
*
Abbrev.
TCSRW
TCW
CKSTP2
PMR3
B4WI
R
5
1
TCSRWE
R/W
R/W
R/W
R/W
R/W
R/W
4
0
*
B2WI
R
3
1
Initial Value
H'AA
H'00
H'FF
H'00
WDON
R/W
2
0
*
B0WI
R
1
1
Address
H'FFB2
H'FFB3
H'FFFB
H'FFCA
(initial value)
WRST
R/W
0
0
*