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參數(shù)資料
| 型號： | PIC12F506 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 8/14-Pin, 8-Bit Flash Microcontroller |
| 中文描述： | 8/14-Pin，8位閃存微控制器 |
| 文件頁數(shù)： | 70/116頁 |
| 文件大?。?/td> | 907K |
| 代理商： | PIC12F506 |
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PIC12F510/16F506
DS41268C-page 68
Preliminary
2007 Microchip Technology Inc.
10.7
Time-out Sequence, Power-down
and Wake-up from Sleep Status
Bits (TO, PD, GPWUF/RBWUF)
The TO, PD and (GPWUF/RBWUF) bits in the STATUS
register can be tested to determine if a Reset condition
has been caused by a power-up condition, a MCLR or
Watchdog Timer (WDT) Reset.
TABLE 10-8:
TO/PD/(GPWUF/RBWUF)
STATUS AFTER RESET
10.8
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 PIC12F510/16F506 devices when a brown-
out occurs, external brown-out protection circuits may
be built, as shown in Figure 10-13 and Figure 10-14.
FIGURE 10-13:
BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 10-14:
BROWN-OUT
PROTECTION CIRCUIT 2
FIGURE 10-15:
BROWN-OUT
PROTECTION CIRCUIT 3
CWUF
GPWUF/
RBWUF
TO
PD
Reset Caused By
0
0
0
0
WDT wake-up from
Sleep
WDT time-out (not
from Sleep)
MCLR wake-up from
Sleep
Power-up
MCLR not during
Sleep
Wake-up from Sleep
on pin change
Wake-up from Sleep
on comparator
change
0
0
0
u
0
0
1
0
0
0
0
0
1
u
1
u
0
1
1
0
1
0
1
0
Legend:
u
= unchanged
Note
1:
This circuit will activate Reset when V
DD
goes
below Vz + 0.7V (where Vz = Zener voltage).
Pin must be configured as MCLR.
2:
33k
10k
40k
(1)
V
DD
MCLR
(2)
PIC12F510
PIC16F506
V
DD
Q1
Note
1:
This brown-out circuit is less expensive,
although less accurate. Transistor Q1 turns
off when V
DD
is below a certain level such
that:
R1
R1 + R2
2:
Pin must be configured as MCLR.
V
DD
= 0.7V
R2
40k
(1)
V
DD
MCLR
(2)
PIC12F510
PIC16F506
R1
Q1
V
DD
Note:
This brown-out protection circuit employs
Microchip Technology’s MCP809 microcon-
troller supervisor. There are 7 different trip
point selections to accommodate 5V to 3V
systems.
MCLR
PIC12F510
PIC16F506
V
DD
V
DD
V
SS
RST
MCP809
V
DD
Bypass
Capacitor
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