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PIC16F506T-E/MS 数据表(PDF) 70 Page - Microchip Technology

部件名 PIC16F506T-E/MS
功能描述  8/14-Pin, 8-Bit Flash Microcontroller
PDF  116 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

PIC16F506T-E/MS 数据表(HTML) 70 Page - Microchip Technology

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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 (VDD)
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
00
0
0
WDT wake-up from
Sleep
0
0
0
u
WDT time-out (not
from Sleep)
00
1
0
MCLR wake-up from
Sleep
0
0
1
1
Power-up
00
u
u
MCLR not during
Sleep
0
1
1
0
Wake-up from Sleep
on pin change
1
0
1
0
Wake-up from Sleep
on comparator
change
Legend: u = unchanged
Note
1:
This circuit will activate Reset when VDD goes
below Vz + 0.7V (where Vz = Zener voltage).
2:
Pin must be configured as MCLR.
33k
10k
40k(1)
VDD
MCLR(2)
PIC12F510
VDD
Q1
PIC16F506
Note
1:
This brown-out circuit is less expensive,
although less accurate. Transistor Q1 turns
off when VDD is below a certain level such
that:
2:
Pin must be configured as MCLR.
VDD •
R1
R1 + R2
= 0.7V
R2
40k(1)
VDD
MCLR(2)
PIC12F510
R1
Q1
VDD
PIC16F506
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
VDD
VDD
VSS
RST
MCP809
VDD
Bypass
Capacitor
PIC16F506



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