PIC16C782 Microchip Technology Inc., PIC16C782 Datasheet - Page 123

• Manufacturer Part Number: PIC16C782
• Description: 8-bit Cmos Microcontrollers With A/d, D/a, Opamp, Comparators And Psmc
• Manufacturer: Microchip Technology Inc.

14.3
The PIC16C781/782 devices have several different
RESETS. These RESETS are grouped into two classi-
fications: power-up and non power-up. The power-up
type RESETS are the Power-on and Brown-out
Resets, which assume the device V
normal operating range for the device’s configuration.
The non power-up type RESETS assume normal oper-
ating limits were maintained before/during and after the
RESET.
• Power-on Reset (POR)
• Programmable Brown-out Reset (PBOR)
• Non Power-up (MCLR) Reset during normal
• MCLR Reset during SLEEP
• WDT Reset (during normal operation)
FIGURE 14-4:
RA7/OSC1/
RA5/MCLR/V
CLKIN
operation
2001 Microchip Technology Inc.
V
DD
RESET
PP
Dedicated
Oscillator
OST/PWRT
Programmable
V
Module
Brown-out
Detect
DD
WDT
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
Rise
OST
PWRT
Time-out
10-bit Ripple Counter
10-bit Ripple Counter
Power-on Reset
BODEN
External
RESET
SLEEP
DD
was below its
Preliminary
Enable PWRT
Enable OST
Some registers are not affected in any RESET condi-
tion. Their status is unknown on a Power-up Reset and
unchanged in any other RESET. Most other registers
are placed into an initialized state upon RESET. How-
ever, they are not affected by a WDT Reset during
SLEEP, because this is considered a WDT Wake-up,
which is viewed as the resumption of normal operation.
Several status bits have been provided to indicate
which RESET occurred (see
Table 14-5 for a full description of RESET states of
special registers.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 14-4.
These devices have a MCLR noise filter in the MCLR
Reset path. The filter detects and ignores small pulses.
It should be noted that a WDT Reset does not drive
MCLR pin low.
PIC16C781/782
S
R
DS41171A-page 121
Table 14-4).
Q
Chip_Reset
See