PIC16HV785 Microchip Technology Inc., PIC16HV785 Datasheet - Page 111

• Manufacturer Part Number: PIC16HV785
• Description: 20-pin Flash-based 8-bit Cmos Microcontroller
• Manufacturer: Microchip Technology Inc.

15.2
The PIC16F785/HV785 differentiates between various
kinds of Reset:
• Power-on Reset (POR)
• WDT Reset during normal operation
• WDT Reset during Sleep
• MCLR Reset during normal operation
• MCLR Reset during Sleep
• Brown-out Reset (BOR)
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 Reset (BOR)
FIGURE 15-1:
© 2006 Microchip Technology Inc.
MCLR/V
Note
CLKI pin
OSC1/
V
DD
Reset
PP
1:
pin
LFINTOSC
Refer to the Configuration Word register (Register 15-1).
OST/PWRT
Brown-out
V
Module
DD
Detect
WDT
Reset
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
Rise
OST
PWRT
(1)
10-bit Ripple Counter
WDT
Time-out
Reset
11-bit Ripple Counter
SBOREN
Power-on Reset
BOREN
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 15-2. These bits are
used in software to determine the nature of the Reset.
See Table 15-4 for a full description of Reset states of
all registers.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 15-1.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Section 19.0 “Electrical
Specifications” for pulse width specifications.
PIC16F785/HV785
Enable PWRT
Enable OST
S
R
DS41249D-page 109
Q
Chip_Reset