參數(shù)資料
型號: PIC16F676-E/SL
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO14
封裝: 3.90 MM, LEAD FREE, PLASTIC, SOIC-14
文件頁數(shù): 88/132頁
文件大?。?/td> 1344K
代理商: PIC16F676-E/SL
2010 Microchip Technology Inc.
DS40039F-page 59
PIC16F630/676
9.3
Reset
The PIC16F630/676 differentiates between various
kinds of Reset:
a)
Power-on Reset (POR)
b)
WDT Reset during normal operation
c)
WDT Reset during Sleep
d)
MCLR Reset during normal operation
e)
MCLR Reset during Sleep
f)
Brown-out Detect (BOD)
Some registers are not affected in any Reset condition;
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
MCLR Reset
WDT Reset
WDT Reset during Sleep
Brown-out Detect (BOD)
They are not affected by a WDT wake-up, since this is
viewed as the resumption of normal operation. TO and
PD bits are set or cleared differently in different Reset
situations as indicated in Table 9-4. These bits are
used in software to determine the nature of the Reset.
See Table 9-7 for a full description of Reset states of all
registers.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 9-4.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Table 12-4 in Electrical
Specifications Section for pulse-width specification.
FIGURE 9-4:
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
S
R
Q
External
Reset
MCLR/
VDD
OSC1/
WDT
Module
VDD Rise
Detect
OST/PWRT
On-chip(1)
RC OSC
WDT
Time-out
Power-on Reset
OST
PWRT
Chip_Reset
10-bit Ripple Counter
Reset
Enable OST
Enable PWRT
SLEEP
See Table 9-3 for time-out situations.
Note
1:
This is a separate oscillator from the INTOSC/EC oscillator.
Brown-out
Reset
BODEN
CLKIN
pin
VPP pin
10-bit Ripple Counter
Q
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