PIC16C662-20/TQ Microchip Technology, PIC16C662-20/TQ Datasheet - Page 59
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PIC16C662-20/TQ
Manufacturer Part Number
PIC16C662-20/TQ
Description
8-Bit EPROM Microcontrollers with Analog Comparators
Manufacturer
Microchip Technology
Datasheet
1.PIC16C662-20TQ.pdf
(136 pages)
- Current page: 59 of 136
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9.3
The PIC16CXXX differentiates between various kinds
of reset:
a)
b)
c)
d)
e)
f)
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
FIGURE 9-7:
Note 1: This is a separate oscillator from the RC oscillator of the CLKIN pin.
V
1996 Microchip Technology Inc.
MCLR/
OSC1/
CLKIN
PP
V
Pin
Power-on reset (POR)
MCLR reset during normal operation
MCLR reset during SLEEP
WDT reset (normal operation)
Brown-out Reset (BOR)
Parity Error Reset (PER)
DD
Pin
Reset
On-chip
RC OSC
OST/PWRT
Brown-out
Program
Memory
V
Module
(1)
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
detect
Parity
WDT
DD
Reset
rise
OST
PWRT
SLEEP
10-bit Ripple-counter
WDT Time-out
10-bit Ripple-counter
Power-on Reset
MPEEN
BODEN
External
Reset
Preliminary
PIC16C64X & PIC16C66X
Enable PWRT
Enable OST
state” on Power-on reset, MCLR, WDT reset,
Brown-out Reset, Parity Error Reset, and on MCLR
reset during SLEEP. They are not affected by a WDT
wake-up, since this is viewed as the resumption of nor-
mal operation. TO and PD bits are set or cleared differ-
ently 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 9-6 for a full descrip-
tion of reset states of all registers.
A simplified block diagram of the on-chip reset circuit is
shown in Figure 9-7.
The MCLR reset path has a noise filter to detect and
ignore small pulses. See Table 12-6 for pulse width
specification.
See Table 9-3 for time-out situations.
S
R
DS30559A-page 59
Q
Chip_Reset
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