AC244026 Microchip Technology, AC244026 Datasheet - Page 33

• Manufacturer Part Number: AC244026
• Description: Processor Extension Pak (PIC16F727-ICE) 200K Device Emulator - Debugger Accessor
• Manufacturer: Microchip Technology
• Series: -r

Specifications of AC244026

• Accessory Type: Debug Interface Module
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC16LF727

3.0
The PIC16F72X/PIC16LF72X 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 (POR)
• MCLR Reset
• MCLR Reset during Sleep
• WDT Reset
• Brown-out Reset (BOR)
FIGURE 3-1:
© 2009 Microchip Technology Inc.
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)
RESETS
MCLR/V
OSC1/
CLKIN
Note 1:
V
DD
PP
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
WDTOSC
OST/PWRT
Refer to the Configuration Word Register 1 (Register 8-1).
Brown-out
Module
WDT
Reset
POR
MCLRE
OST
PWRT
(1)
10-bit Ripple Counter
WDT
Time-out
Reset
11-bit Ripple Counter
BOREN
Power-on Reset
Sleep
PIC16F72X/PIC16LF72X
Most registers 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 3-3.
These bits are used in software to determine the nature
of the Reset.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 3-1.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Section 23.0 “Electrical
Specifications” for pulse width specifications.
Enable PWRT
Enable OST
DS41341E-page 33
Chip_Reset