參數(shù)資料
型號： PIC16F77
廠商： Microchip Technology Inc.
英文描述： 40-Pin 8-Bit CMOS FLASH Microcontrollers(40腳、8位CMOS 閃速微控制器)
中文描述： 40引腳8位CMOS閃存微控制器（40腳，8位的CMOS閃速微控制器）
文件頁數(shù)： 99/170頁
文件大?。?/td> 3150K
代理商： PIC16F77
2000 Microchip Technology Inc.
Advance Information
DS30325A-page 99
PIC16F7X
12.3
RESET
The PIC16F7X 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 situa-
tions, as indicated in Table 12-4. These bits are used in
software to determine the nature of the RESET. See
Table 12-6 for a full description of RESET states of all
registers.
A simplified block diagram of the on-chip RESET circuit
is shown in Figure 12-4.
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 12-4: 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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