HD64336901G Renesas Technology, HD64336901G Datasheet - Page 212

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

13.2.2
TCWD is an 8-bit readable/writable up-counter. When TCWD overflows from H'FF to H'00, the
internal reset signal is generated and the WRST bit in TCSRWD is set to 1. TCWD is initialized to
H'00.
13.2.3
TMWD selects the input clock.
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Rev. 1.00, 11/03, page 184 of 376
Bit
7 to 4
3
2
1
0
Don't care
Bit Name
CKS3
CKS2
CKS1
CKS0
Timer Counter WD (TCWD)
Timer Mode Register WD (TMWD)
Initial
Value
All 1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
Description
Reserved
These bits are always read as 1.
Clock Select 3 to 0
Select the clock to be input to TCWD.
1000: Internal clock: counts on /64
1001: Internal clock: counts on /128
1010: Internal clock: counts on /256
1011: Internal clock: counts on /512
1100: Internal clock: counts on /1024
1101: Internal clock: counts on /2048
1110: Internal clock: counts on /4096
1111: Internal clock: counts on 8192
0XXX: WDT dedicated internal oscillator
For the overflow periods of the WDT dedicated internal
oscillator, see section 20, Electrical Characteristics.