參數(shù)資料
型號: 16F872
廠商: Microchip Technology Inc.
英文描述: CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT
中文描述: 28引腳,8位閃存微控制器的CMOS
文件頁數(shù): 99/160頁
文件大?。?/td> 2600K
代理商: 16F872
1999 Microchip Technology Inc.
Preliminary
DS30221A-page 99
PIC16F872
11.3
Reset
The PIC16F872 differentiates between various kinds of
reset:
Power-on Reset (POR)
MCLR Reset during normal operation
MCLR Reset during SLEEP
WDT Reset (during normal operation)
WDT Wake-up (during SLEEP)
Brown-out Reset (BOR)
Some registers are not affected in any RESET condi-
tion. Their status is unknown on POR and unchanged
in any other RESET. Most other registers are reset to a
“reset state” on Power-on Reset (POR), on the MCLR
and WDT Reset, on MCLR Reset during SLEEP, and
Brown-out Reset (BOR). They are not affected by a
WDT Wake-up, which is viewed as the resumption of
normal operation. The TO and PD bits are set or
cleared differently in different reset situations as indi-
cated in Table 11-4. These bits are used in software to
determine the nature of the reset. See Table 11-6 for a
full description of reset states of all registers.
A simplified block diagram of the on-chip reset circuit is
shown in Figure 11-4.
These devices have a MCLR noise filter in the MCLR
Reset path. The filter will detect and ignore small
pulses.
It should be noted that a WDT Reset
does not drive
MCLR pin low.
FIGURE 11-4: SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
S
R
Q
External
Reset
MCLR
V
DD
OSC1
WDT
Module
V
DD
rise
detect
OST/PWRT
On-chip
RC OSC
WDT
Time-out
Reset
Power-on Reset
OST
10-bit Ripple counter
PWRT
Chip_Reset
10-bit Ripple counter
Enable OST
Enable PWRT
SLEEP
Note 1:
This is a separate oscillator from the RC oscillator of the CLKIN pin.
Brown-out
Reset
BODEN
(1)
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