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HD64F2149YV bảng dữ liệu(PDF) 447 Page - Renesas Technology Corp

tên linh kiện HD64F2149YV
Giải thích chi tiết về linh kiện  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Section 14 Watchdog Timer (WDT)
Rev. 3.00 Jan 18, 2006 page 419 of 1044
REJ09B0280-0300
TCNT value
H'00
Time
H'FF
WT/
IT = 1
TME = 1
H'00 written
to TCNT
WT/
IT = 1
TME = 1
H'00 written
to TCNT
518 system
clock periods
Internal reset signal
Overflow
RESO and internal
reset generated
OVF = 1*
RESO signal
WT/
IT: Timer mode select bit
TME:
Timer enable bit
OVF:
Overflow flag
Note: * Cleared to 0 by an internal reset when OVF is set to 1. XRST is cleared to 0.
132 system
clock periods
Figure 14.3 Operation in Watchdog Timer Mode (RST/
NMI
NMI
NMI
NMI = 1)
14.3.2
Interval Timer Operation
To use the WDT as an interval timer, clear the WT/
IT bit in TCSR to 0 and set the TME bit to 1.
An interval timer interrupt (WOVI) is generated each time TCNT overflows, provided that the
WDT is operating as an interval timer, as shown in figure 14.4. This function can be used to
generate interrupt requests at regular intervals.



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