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| 型號： | 16F84A |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CAT 5E CROSSOVER PATCH CORD CABLE BLUE 20 FT |
| 中文描述： | 18引腳閃存/ EEPROM的8位微控制器 |
| 文件頁數(shù)： | 46/124頁 |
| 文件大?。?/td> | 1322K |
| 代理商： | 16F84A |
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PIC16F8X
DS30430C-page 46
1998 Microchip Technology Inc.
8.7
Time-out Sequence and Power-down
Status Bits (TO/PD)
On power-up (Figure 8-10, Figure 8-11, Figure 8-12
and Figure 8-13) the time-out sequence is as follows:
First PWRT time-out is invoked after a POR has
expired. Then the OST is activated. The total time-out
will vary based on oscillator configuration and PWRTE
configuration bit status. For example, in RC mode with
the PWRT disabled, there will be no time-out at all.
TABLE 8-5
TIME-OUT IN VARIOUS
SITUATIONS
Since the time-outs occur from the POR reset pulse, if
MCLR is kept low long enough, the time-outs will
expire. Then bringing MCLR high, execution will begin
immediately (Figure 8-10). This is useful for testing
purposes or to synchronize more than one PIC16F8X
device when operating in parallel.
Table 8-6 shows the significance of the TO and PD bits.
Table 8-3 lists the reset conditions for some special
registers, while Table 8-4 lists the reset conditions for
all the registers.
TABLE 8-6
STATUS BITS AND THEIR
SIGNIFICANCE
8.8
Reset on Brown-Out
A brown-out is a condition where device power (V
DD
)
dips below its minimum value, but not to zero, and then
recovers. The device should be reset in the event of a
brown-out.
To reset a PIC16F8X device when a brown-out occurs,
external brown-out protection circuits may be built, as
shown in Figure 8-14 and Figure 8-15.
FIGURE 8-14: BROWN-OUT PROTECTION
CIRCUIT 1
FIGURE 8-15: BROWN-OUT PROTECTION
CIRCUIT 2
V
DD
Oscillator
Configuration
Power-up
Wake-up
from
SLEEP
PWRT
Enabled
72 ms +
1024T
OSC
72 ms
PWRT
Disabled
1024T
OSC
XT, HS, LP
1024T
OSC
—
—
TO
PD
Condition
1
0
x
0
0
1
1
1
x
0
1
0
1
0
Power-on Reset
Illegal, TO is set on POR
Illegal, PD is set on POR
WDT Reset (during normal operation)
WDT Wake-up
MCLR Reset during normal operation
MCLR Reset during SLEEP or interrupt
wake-up from SLEEP
This circuit will activate reset when V
DD
goes below
(Vz + 0.7V) where Vz = Zener voltage.
V
DD
33k
10k
40k
V
DD
MCLR
PIC16F8X
This brown-out circuit is less expensive, although less
accurate. Transistor Q1 turns off when V
DD
is below a
certain level such that:
V
DD
R1
R1 + R2
= 0.7V
R2
40k
V
DD
MCLR
PIC16F8X
R1
Q1
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