參數(shù)資料
型號: pic16cr54c
廠商: Microchip Technology Inc.
英文描述: ROM-Based 8-Bit CMOS Microcontroller Series(8位CMOS微控制器)
中文描述: 基于ROM的8位CMOS微控制器系列(8位的CMOS微控制器)
文件頁數(shù): 34/84頁
文件大?。?/td> 654K
代理商: PIC16CR54C
PIC16CR54C
DS40191A-page 34
Preliminary
1998 Microchip Technology Inc.
7.7
Time-Out Sequence and Power Down
Status Bits (TO/PD)
The TO and PD 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, or a MCLR or WDT wake-up reset.
These STATUS bits are only affected by events listed
in Table 7-7.
Table 7-3 lists the reset conditions for the special
function registers, while Table 7-4 lists the reset
conditions for all the registers.
TABLE 7-6:
TO/PD STATUS AFTER
RESET
TO
PD
RESET was caused by
Power-up (POR)
MCLR reset (normal operation)
(1)
MCLR wake-up reset (from SLEEP)
WDT reset (normal operation)
WDT wake-up reset (from SLEEP)
Legend:
u
= unchanged
Note 1:
The TO and PD bits maintain their status (
u
) until
a reset occurs. A low-pulse on the MCLR input
does not change the TO and PD status bits.
1
1
u
u
1
0
0
1
0
0
TABLE 7-7:
EVENTS AFFECTING TO/PD
STATUS BITS
Event
TO
PD
Remarks
Power-up
WDT Time-out
SLEEP
instruction
CLRWDT
instruction
Legend:
u
= unchanged
A WDT time-out will occur regardless of the status of the TO
bit. A
SLEEP
instruction will be executed, regardless of the
status of the PD bit. Table 7-6 reflects the status of TO and
PD after the corresponding event.
1
1
0
u
No effect on PD
1
0
1
1
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 PIC16CR54C 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
This circuit will activate reset when V
DD
goes below Vz +
0.7V (where Vz = Zener voltage).
33k
10k
40k
V
DD
MCLR
PIC16CR54C
V
DD
Q1
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
V
DD
= 0.7V
R2
40k
V
DD
MCLR
PIC16CR54C
R1
Q1
V
DD
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