PIC16F684-I/SLG Microchip, PIC16F684-I/SLG Datasheet - Page 96

• Manufacturer Part Number: PIC16F684-I/SLG
• Description: pic, flash, Microcontrollers, Microprocessors, Semiconductors and Actives, ic, mcu
• Manufacturer: Microchip

PIC16F684
12.3
The PIC16F684 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
state” on:
• Power-on Reset
• MCLR Reset
• MCLR Reset during Sleep
• WDT Reset
• Brown-out Detect (BOD)
FIGURE 12-1:
DS41202C-page 94
MCLR/V
Power-on Reset (POR)
WDT Reset during normal operation
WDT Reset during Sleep
Brown-out Detect (BOD)
MCLR Reset during normal operation
MCLR Reset during Sleep
CLKI pin
OSC1/
Note 1:
V
DD
Reset
PP
pin
LFINTOSC
OST/PWRT
Refer to the Configuration Word register (Register 12-1).
Brown-out
V
Module
Detect
DD
Detect
WDT
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
Rise
OST
PWRT
(1)
10-bit Ripple Counter
WDT
Time-out
Reset
11-bit Ripple Counter
SBODEN
BODEN
Power-on Reset
External
Reset
SLEEP
Preliminary
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 12-2. These bits are
used in software to determine the nature of the Reset.
See Table 12-4 for a full description of Reset states of
all registers.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 12-1.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Section 15.0 “Electrical
Specifications” for pulse-width specifications.
Enable PWRT
Enable OST
 2004 Microchip Technology Inc.
S
R
Q
Chip_Reset