PIC16F684-ISL

Manufacturer Part NumberPIC16F684-ISL
ManufacturerMicrochip Technology Inc.
PIC16F684-ISL datasheets
 

Specifications of PIC16F684-ISL

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PIC16F684
12.3
Reset
The PIC16F684 differentiates between various kinds of
Reset:
a)
Power-on Reset (POR)
b)
WDT Reset during normal operation
c)
WDT Reset during Sleep
d)
MCLR Reset during normal operation
e)
MCLR Reset during Sleep
f)
Brown-out Detect (BOD)
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:
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
External
Reset
MCLR/V
pin
PP
SLEEP
WDT
WDT
Module
Time-out
Reset
V
Rise
DD
Detect
Power-on Reset
V
DD
(1)
Brown-out
Detect
BODEN
SBODEN
OST/PWRT
OST
10-bit Ripple Counter
OSC1/
CLKI pin
PWRT
11-bit Ripple Counter
LFINTOSC
Note 1:
Refer to the Configuration Word register (Register 12-1).
DS41202C-page 94
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
Preliminary
 2004 Microchip Technology Inc.
S
Chip_Reset
R
Q