PIC18F65K22-I/PTRSL Microchip Technology, PIC18F65K22-I/PTRSL Datasheet - Page 68

• Manufacturer Part Number: PIC18F65K22-I/PTRSL
• Description: MCU PIC 32K FLASH MEM XLP 64TQFP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F65K22-I/PTRSL

• Core Size: 8-Bit
• Program Memory Size: 32KB (16K x 16)
• Core Processor: PIC
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 16x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Controller Family/series: PIC18
• Eeprom Memory Size: 1024Byte
• Ram Memory Size: 2048Byte
• Cpu Speed: 16MIPS
• No. Of Timers: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F87K22 FAMILY
4.7
The Ultra Low-Power Wake-up (ULPWU) on pin RA0
allows a slow falling voltage to generate an interrupt
without excess current consumption.
To use this feature:
1.
2.
3.
4.
5.
When the voltage on RA0 drops below V
wakes up and executes the next instruction.
This feature provides a low-power technique for
periodically waking up the device from Sleep mode.
The time-out is dependent on the discharge time of the
RC circuit on RA0.
When the ULPWU module wakes the device from
Sleep mode, the ULPLVL bit (WDTCON<5>) is set.
Software can check this bit upon wake-up to determine
the wake-up source.
See Example 4-1 for initializing the ULPWU module.
EXAMPLE 4-1:
DS39960B-page 68
TRISAbits.TRISA0 = 0;
PORTAbits.RA0 = 1;
for(i = 0; i < 10000; i++) Nop();
TRISAbits.TRISA0 = 1;
WDTCONbits.ULPEN = 1;
WDTCONbits.ULPSINK = 1;
OSCCONbits.IDLEN = 0;
Sleep();
Charge the capacitor on RA0 by configuring the
RA0 pin to an output and setting it to ‘1’.
Stop charging the capacitor by configuring RA0
as an input.
Discharge the capacitor by setting the ULPEN
and ULPSINK bits in the WDTCON register.
Configure Sleep mode.
Enter Sleep mode.
Ultra Low-Power Wake-up
//***************************
//Charge the capacitor on RA0
//***************************
//*****************************
//Stop Charging the capacitor
//on RA0
//*****************************
//*****************************
//Enable the Ultra Low Power
//Wakeup module and allow
//capacitor discharge
//*****************************
//For Sleep
//Enter Sleep Mode
//
//for sleep, execution will
//resume here
ULTRA LOW-POWER
WAKE-UP INITIALIZATION
IL
, the device
Preliminary
A series resistor, between RA0 and the external capac-
itor, provides overcurrent protection for the RA0/AN0/
ULPWU pin and enables software calibration of the
time-out (see Figure 4-9).
FIGURE 4-9:
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 delay in Sleep.
This technique compensates for the affects of temper-
ature, voltage and component accuracy. The peripheral
can also be configured as a simple Programmable
Low-Voltage Detect (LVD) or temperature sensor.
Note:
RA0/AN0/ULPWU
For more information, see AN879, “Using
the Microchip Ultra Low-Power Wake-up
Module” (DS00879).
ULTRA LOW-POWER
WAKE-UP INITIALIZATION
 2010 Microchip Technology Inc.