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H8/3021 Datasheet(PDF) 342 Page - Renesas Technology Corp

No. de pieza H8/3021
Descripción Electrónicos  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
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H8/3021 Datasheet(HTML) 342 Page - Renesas Technology Corp

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10. Watchdog Timer
Rev.2.00 Mar. 22, 2007 Page 318 of 684
REJ09B0352-0200
10.2
Register Descriptions
10.2.1
Timer Counter (TCNT)
TCNT is an 8-bit readable and writable* up-counter.
Bit
Initial value
Read/Write
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
0
0
R/W
2
0
R/W
1
0
R/W
When the TME bit is set to 1 in TCSR, TCNT starts counting pulses generated from an internal
clock source selected by bits CKS2 to CKS0 in TCSR. When the count overflows (changes from
H'FF to H'00), the OVF bit is set to 1 in TCSR. TCNT is initialized to H'00 by a reset and when
the TME bit is cleared to 0.
Note: * TCNT is write-protected by a password. For details see section 10.2.4, Notes on
Register Access.



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