HD64336901G Renesas Technology, HD64336901G Datasheet - Page 210

• Manufacturer Part Number: HD64336901G
• Description: (HD64xxx Series) 16-BIT MICROCONTROLLER
• Manufacturer: Renesas Technology

13.2
The watchdog timer has the following registers.
13.2.1
TCSRWD performs the TCSRWD and TCWD write control. TCSRWD also controls the
watchdog timer operation and indicates the operating state. TCSRWD must be rewritten by using
the MOV instruction. The bit manipulation instruction cannot be used to change the setting value.
Rev. 1.00, 11/03, page 182 of 376
Bit
7
6
5
4
3
Timer control/status register WD (TCSRWD)
Timer counter WD (TCWD)
Timer mode register WD (TMWD)
Bit Name
B6WI
TCWE
B4WI
TCSRWE
B2WI
Register Descriptions
Timer Control/Status Register WD (TCSRWD)
Initial
Value
1
0
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
Description
Bit 6 Write Inhibit
The TCWE bit can be written only when the write value of
the B6WI bit is 0.
This bit is always read as 1.
Timer Counter WD Write Enable
TCWD can be written when the TCWE bit is set to 1.
When writing data to this bit, the value for bit 7 must be 0.
Bit 4 Write Inhibit
The TCSRWE bit can be written only when the write
value of the B4WI bit is 0. This bit is always read as 1.
Timer Control/Status Register W Write Enable
The WDON and WRST bits can be written when the
TCSRWE bit is set to 1.
When writing data to this bit, the value for bit 5 must be 0.
Bit 2 Write Inhibit
This bit can be written to the WDON bit only when the
write value of the B2WI bit is 0.
This bit is always read as 1.