PIC18F4431-I/P Microchip Technology Inc., PIC18F4431-I/P Datasheet - Page 42
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PIC18F4431-I/P
Manufacturer Part Number
PIC18F4431-I/P
Description
Microcontroller; 16 KB Flash; 768 RAM; 256 EEPROM; 36 I/O; 40-Pin-PDIP
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F4431-IP.pdf
(396 pages)
Specifications of PIC18F4431-I/P
A/d Inputs
9-Channel, 10-Bit
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
36
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
16K Bytes
Ram Size
768 Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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PIC18F2331/2431/4331/4431
3.4.4
An exit from a power-managed run mode to its corre-
sponding idle mode is executed by setting the IDLEN
bit and executing a SLEEP instruction. The CPU is
halted at the beginning of the instruction following the
SLEEP instruction. There are no changes to any of the
clock source status bits (OSTS, IOFS, or T1RUN).
While the CPU is halted, the peripherals continue to be
clocked from the previously selected clock source.
3.4.5
An exit from a power-managed run mode to Sleep
mode is executed by clearing the IDLEN and
SCS1:SCS0 bits and executing a SLEEP instruction.
The code is no different than the method used to invoke
Sleep mode from the normal operating (full power)
mode.
The primary clock and internal oscillator block are dis-
abled. The INTRC will continue to operate if the WDT
is enabled. The Timer1 oscillator will continue to run, if
enabled, in the T1CON register. All clock source status
bits are cleared (OSTS, IOFS and T1RUN).
DS39616B-page 40
EXIT TO IDLE MODE
EXIT TO SLEEP MODE
Preliminary
3.5
An exit from any of the power-managed modes is trig-
gered by an interrupt, a Reset or a WDT time-out. This
section discusses the triggers that cause exits from
power-managed modes. The clocking subsystem
actions are discussed in each of the power-managed
modes (see Sections 3.2 through 3.4).
Device behavior during Low-power mode exits is
summarized in Table 3-3.
3.5.1
Any of the available interrupt sources can cause the
device to exit a power-managed mode and resume full
power operation. To enable this functionality, an inter-
rupt source must be enabled by setting its enable bit in
one of the INTCON or PIE registers. The exit sequence
is initiated when the corresponding interrupt flag bit is
set. On all exits from Low-power mode by interrupt,
code execution branches to the interrupt vector if the
GIE/GIEH bit (INTCON<7>) is set. Otherwise, code
execution continues or resumes without branching
(see Section 9.0 “Interrupts”).
Note:
Wake From Power-Managed
Modes
If application code is timing sensitive, it
should wait for the OSTS bit to become set
before continuing. Use the interval during
the Low-power exit sequence (before
OSTS is set) to perform timing insensitive
“housekeeping” tasks.
EXIT BY INTERRUPT
2003 Microchip Technology Inc.
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