參數(shù)資料
型號(hào): 16F84A
廠商: Microchip Technology Inc.
英文描述: CAT 5E CROSSOVER PATCH CORD CABLE BLUE 20 FT
中文描述: 18引腳閃存/ EEPROM的8位微控制器
文件頁數(shù): 41/124頁
文件大?。?/td> 1322K
代理商: 16F84A
PIC16F8X
1998 Microchip Technology Inc.
DS30430C-page 41
8.3
Reset
The PIC16F8X 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)
Figure 8-8 shows a simplified block diagram of the
on-chip reset circuit. The MCLR reset path has a noise
filter to ignore small pulses. The electrical specifica-
tions state the pulse width requirements for the MCLR
pin.
Some registers are not affected in any reset condition;
their status is unknown on a POR reset and unchanged
in any other reset. Most other registers are reset to a
“reset state” on POR, MCLR or WDT reset during
normal operation and on MCLR reset during SLEEP.
They are not affected by a WDT reset during SLEEP,
since this reset is viewed as the resumption of normal
operation.
Table 8-3 gives a description of reset conditions for the
program counter (PC) and the STATUS register.
Table 8-4 gives a full description of reset states for all
registers.
The TO and PD bits are set or cleared differently in dif-
ferent reset situations (Section 8.7). These bits are
used in software to determine the nature of the reset.
FIGURE 8-8:
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
S
R
Q
External
Reset
MCLR
V
DD
OSC1/
CLKIN
WDT
Module
V
rise
detect
OST/PWRT
On-chip
RC OSC
(1)
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.
See Table 8-5
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