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PIC18LF26J53 Datasheet(PDF) 63 Page - Microchip Technology

Part # PIC18LF26J53
Description  28/44-Pin, High-Performance USB Microcontrollers with nanoWatt XLP Technology
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18LF26J53 Datasheet(HTML) 63 Page - Microchip Technology

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 2010 Microchip Technology Inc.
Preliminary
DS39964B-page 63
PIC18F47J53 FAMILY
A series resistor between RA0 and the external
capacitor provides overcurrent protection for the
RA0/AN0/C1INA/ULPWU/RP0 pin and can allow for
software calibration of the time-out (see Figure 4-9).
FIGURE 4-9:
SERIAL RESISTOR
A timer can be used to measure the charge time and
discharge time of the capacitor. The charge time can
then be adjusted to provide the desired interrupt delay.
This technique will compensate for the affects of
temperature, voltage and component accuracy. The
ULPWU peripheral can also be configured as a simple
Programmable
Low-Voltage
Detect
(LVD)
or
temperature sensor.
4.8
Peripheral Module Disable
All peripheral modules (except for I/O ports) also have
a second control bit that can disable their functionality.
These bits, known as the Peripheral Module Disable
(PMDISx) bits, are generically named “xxxMD” (using
“xxx” as the mnemonic version of the module’s name).
These bits are located in the PMDISx special function
registers. In contrast to the module enable bits (gener-
ically named “xxxEN” and located in bit position seven
of the control registers), the PMDISx bits must be set
(= 1) to disable the modules.
While the PMD and module enable bits both disable a
peripheral’s functionality, the PMD bit completely shuts
down the peripheral, effectively powering down all
circuits and removing all clock sources. This has the
additional effect of making any of the module’s control
and buffer registers, mapped in the SFR space,
unavailable for operations. Essentially, the peripheral
ceases to exist until the PMD bit is cleared.
This differs from using the module enable bit, which
allows the peripheral to be reconfigured and buffer reg-
isters
preloaded,
even
when
the
peripheral’s
operations are disabled.
The PMDISx bits are most useful in highly
power-sensitive applications. In these cases, the bits
can be set before the main body of the application to
remove peripherals that will not be needed at all.
Note:
For more information, refer to AN879,
“Using the Microchip Ultra Low-Power
Wake-up
Module”
application
note
(DS00879).
R1
C1
RA0
TABLE 4-2:
LOW-POWER MODE REGISTERS
Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
PMDIS3
CCP10MD
CCP9MD
CCP8MD
CCP7MD
CCP6MD
CCP5MD
CCP4MD
0000 000–
PMDIS2
—TMR8MD
TMR6MD
TMR5MD
CMP3MD
CMP2MD
CMP1MD
–0–0 0000
PMDIS1
PSPMD(1)
CTMUMD
RTCCMD
TMR4MD
TMR3MD
TMR2MD
TMR1MD
0000 000–
PMDIS0
ECCP3MD ECCP2MD ECCP1MD UART2MD UART1MD
SPI2MD
SPI1MD
ADCMD
0000 0000
Note 1:
Not implemented on 28-pin devices (PIC18F26J53, PIC18F27J53, PIC18LF26J53 and PIC18LF27J53).


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