參數(shù)資料
型號: PIC12F505
廠商: Microchip Technology Inc.
元件分類: 8位微控制器
英文描述: 8/14-Pin, 8-Bit Flash Microcontrollers
中文描述: 8/14-Pin,8位閃存微控制器
文件頁數(shù): 53/100頁
文件大小: 741K
代理商: PIC12F505
2007 Microchip Technology Inc.
Preliminary
DS41236C-page 51
PIC12F508/509/16F505
7.7
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 7-8:
TO/PD/(GPWUF/RBWUF)
STATUS AFTER RESET
7.8
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 PIC12F508/509/16F505 devices when a
brown-out occurs, external brown-out protection
circuits may be built, as shown in Figure 7-13 and
Figure 7-14.
FIGURE 7-13:
BROWN-OUT
PROTECTION CIRCUIT 1
FIGURE 7-14:
BROWN-OUT
PROTECTION CIRCUIT 2
FIGURE 7-15:
BROWN-OUT
PROTECTION CIRCUIT 3
GPWUF/
RBWUF
TO
PD
Reset Caused By
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
u
= unchanged
The TO, PD and GPWUF/RBWUF bits
maintain their status (
u
) until a Reset
occurs. A low-pulse on the MCLR input
does not change the TO, PD and
GPWUF/RBWUF Status bits.
0
0
u
0
0
1
1
0
1
0
u
u
1
1
0
Legend:
Note 1:
Note
1:
This circuit will activate Reset when V
DD
goes
below Vz + 0.7V (where Vz = Zener voltage).
Pin must be confirmed as MCLR.
2:
33k
10k
40k
(1)
V
DD
MCLR
(2)
PIC16F505
PIC12F508
PIC12F509
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 confirmed as MCLR.
V
DD
= 0.7V
R2
40k
(1)
V
DD
MCLR
(2)
PIC16F505
PIC12F508
PIC12F509
R1
Q1
V
DD
Note:
This brown-out protection circuit employs
Microchip Technology’s MCP809 micro-
controller supervisor. There are 7 different
trip point selections to accommodate 5V to
3V systems.
MCLR
PIC16F505
PIC12F508
PIC12F509
V
DD
V
DD
V
SS
RST
MCP809
V
DD
Bypass
Capacitor
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