参数资料
型号: PIC16LC556-04/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, SSOP-20
文件页数: 36/104页
文件大小: 697K
代理商: PIC16LC556-04/SS
1996 Microchip Technology Inc.
Preliminary
DS40143A-page 37
PIC16C55X
7.3
Reset
The PIC16C55X differentiates between various kinds
of reset:
a)
Power-on reset (POR)
b)
MCLR reset during normal operation
c)
MCLR reset during SLEEP
d)
WDT reset (normal operation)
e)
WDT wake-up (SLEEP)
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, on MCLR or WDT reset and
on MCLR reset during SLEEP. 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 7-4. These bits are used in software to determine
the nature of the reset. See Table 7-6 for a full descrip-
tion of reset states of all registers.
A simplied block diagram of the on-chip reset circuit is
shown in Figure 7-7.
The MCLR reset path has a noise lter to detect and
ignore small pulses. See Table 10-4 for pulse width
specication.
FIGURE 7-7:
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 7-3 for time-out situations.
Note 1:
This is a separate oscillator from the RC oscillator of the CLKIN pin.
CLKIN
Pin
VPP Pin
10-bit Ripple-counter
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