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H8SX1663 Datasheet(PDF) 695 Page - Renesas Technology Corp

Part # H8SX1663
Description  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1158 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8SX1663 Datasheet(HTML) 695 Page - Renesas Technology Corp

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Section 14 Watchdog Timer (WDT)
Rev.1.00 Jun. 07, 2006 Page 643 of 1102
REJ09B0294-0100
14.3
Register Descriptions
The WDT has the following three registers. To prevent accidental overwriting, TCSR, TCNT, and
RSTCSR have to be written to in a method different from normal registers. For details, see section
14.6.1, Notes on Register Access.
• Timer counter (TCNT)
• Timer control/status register (TCSR)
• Reset control/status register (RSTCSR)
14.3.1
Timer Counter (TCNT)
TCNT is an 8-bit readable/writable up-counter. TCNT is initialized to H'00 when the TME bit in
TCSR is cleared to 0.
Bit
Bit Name
Initial Value
R/W
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
R/W
14.3.2
Timer Control/Status Register (TCSR)
TCSR selects the clock source to be input to TCNT, and the timer mode.
Bit
Bit Name
Initial Value
R/W
Note:
* Only 0 can be written to this bit, to clear the flag.
7
OVF
0
R/(W)*
6
WT/
IT
0
R/W
5
TME
0
R/W
4
1
R
3
1
R
2
CKS2
0
R/W
1
CKS1
0
R/W
0
CKS0
0
R/W



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