參數(shù)資料
型號(hào)： C508
廠商： Electronic Theatre Controls, Inc.
英文描述： Previous Vectron Model Numbers
中文描述： 前Vectron型號(hào)
文件頁數(shù)： 57/93頁
文件大?。?/td> 1204K
代理商： C508
C508
Data Sheet
53
2000-08
Figure 27
Functional Block Diagram of the Oscillator Watchdog
Fast Internal Reset after Power-On
Normally the members of the 8051 family (e.g. SAB 80C52) do not enter their default
reset state before the on-chip oscillator starts. In the C508, after power-on, the Oscillator
Watchdog’s RC oscillator starts working within a very short start-up time (typ. less than
2
μ
s). The watchdog circuitry detects a failure condition for the on-chip oscillator
because they have not yet started (a failure is always recognized if the watchdog’s RC
oscillator runs faster than the gated PLL clock output). As long as this condition is valid
the watchdog uses the RC oscillator output as the clock source for the chip. This allows
the chip to be correctly reset and brings all ports to the defined state. The exception is
Port 1, which will be at its default state when external reset is active.
f
1
MCB04088
Frequency
Comparator
÷ 5
Control
Logic
On-Chip
Oscillator
XTAL2
XTAL1
Control
Logic
P5.7/
INT7
P3.2/
INT0
EWPD
(PCON1.0)
WS
(PCON1.4)
Power-down
mode activated
Start/
stop
Start/
stop
f
RC
f
OSC
f
2
Delay
f
2
<
f
1
≥
1
RC
Oscillator
OWDS
IP0 (A9
H
)
Power-down mode
wake-up interrupt
Internal Reset
System
Clock
Generator
System Clock
(2 x
f
OCS
)
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