RFPIC12F675 MICROCHIP [Microchip Technology], RFPIC12F675 Datasheet - Page 61

• Manufacturer Part Number: RFPIC12F675
• Description: 20-Pin FLASH-Based 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter
• Manufacturer: MICROCHIP [Microchip Technology]

10.3
The rfPIC12F675 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
• WDT Reset
• WDT Reset during SLEEP
• Brown-out Detect (BOD) Reset
FIGURE 10-4:
 2003 Microchip Technology Inc.
V
OSC1/
MCLR/
CLKIN
Note
PP
V
pin
Power-on Reset (POR)
WDT Reset during normal operation
WDT Reset during SLEEP
MCLR Reset during normal operation
MCLR Reset during SLEEP
Brown-out Detect (BOD)
DD
pin
RESET
1:
On-chip
RC OSC
OST/PWRT
This is a separate oscillator from the INTOSC/EC oscillator.
Brown-out
V
Module
Detect
DD
WDT
Detect
(1)
Rise
OST
PWRT
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
10-bit Ripple Counter
10-bit Ripple Counter
Time-out
Reset
WDT
BODEN
Power-on Reset
External
Reset
SLEEP
Preliminary
Enable PWRT
Enable OST
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 10-4. These bits are
used in software to determine the nature of the RESET.
See Table 10-7 for a full description of RESET states of
all registers.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 10-4.
The MCLR Reset path has a noise filter to detect and
ignore small pulses. See Table 13-4 in Electrical
Specifications Section for pulse width specification.
See Table 10-3 for time-out situations.
rfPIC12F675
S
R
DS70091A-page 59
Q
Q
Chip_Reset