PIC18F4685-I/PT Microchip Technology, PIC18F4685-I/PT Datasheet - Page 186

• Manufacturer Part Number: PIC18F4685-I/PT
• Description: IC PIC MCU FLASH 48KX16 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4685-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 96KB (48K x 16)
• Package / Case: 44-TQFP, 44-VQFP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: CAN, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 36
• Eeprom Size: 1K x 8
• Ram Size: 3.25K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 3328 B
• Interface Type: EUSART, I2C, MSSP, SPI
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 4
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 11 Channel
• Package: 44TQFP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Operating Supply Voltage: 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT44PT3 - SOCKET TRAN ICE 44MQFP/TQFPI3-DB18F4680 - BOARD DAUGHTER ICEPIC3AC164305 - MODULE SKT FOR PM3 44TQFP444-1001 - DEMO BOARD FOR PICMICRO MCUAC164020 - MODULE SKT PROMATEII 44TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F2682/2685/4682/4685
16.4.7.1
The auto-shutdown feature can be configured to allow
automatic restarts of the module following a shutdown
event. This is enabled by setting the PRSEN bit of the
ECCP1DEL register (ECCP1DEL<7>).
In Shutdown mode with PRSEN = 1 (Figure 16-10), the
ECCPASE bit will remain set for as long as the cause
of the shutdown continues. When the shutdown condi-
tion clears, the ECCPASE bit is cleared. If PRSEN = 0
(Figure 16-11), once a shutdown condition occurs, the
ECCPASE bit will remain set until it is cleared by
firmware. Once ECCPASE is cleared, the Enhanced
PWM will resume at the beginning of the next PWM
period.
Independent of the PRSEN bit setting, if the auto-
shutdown source is one of the comparators, the
shutdown condition is a level. The ECCPASE bit
cannot be cleared as long as the cause of the shutdown
persists.
The Auto-Shutdown mode can be forced by writing a ‘1’
to the ECCPASE bit.
FIGURE 16-10:
FIGURE 16-11:
DS39761C-page 186
Note:
Shutdown
Shutdown
Writing to the ECCPASE bit is disabled
while a shutdown condition is active.
ECCPASE bit
PWM
ECCPASE bit
PWM
Auto-Shutdown and Auto-Restart
Activity
Activity
Event
Event
PWM Period
PWM Period
PWM AUTO-SHUTDOWN (PRSEN = 1, AUTO-RESTART ENABLED)
PWM AUTO-SHUTDOWN (PRSEN = 0, AUTO-RESTART DISABLED)
Start of
Start of
Normal PWM
Normal PWM
Event Occurs
Event Occurs
PWM Period
PWM Period
Shutdown
Shutdown
signal levels, or activates the PWM output(s).
completion of a full PWM cycle is indicated by the
16.4.8
When the ECCP1 module is used in the PWM mode, the
application hardware must use the proper external pull-up
and/or pull-down resistors on the PWM output pins. When
the microcontroller is released from Reset, all of the I/O
pins are in the high-impedance state. The external circuits
must keep the power switch devices in the OFF state until
the microcontroller drives the I/O pins with the proper
The ECCP1M1:ECCP1M0 bits (ECCP1CON<1:0>)
allow the user to choose whether the PWM output
signals are active-high or active-low for each pair of
PWM output pins (P1A/P1C and P1B/P1D). The PWM
output polarities must be selected before the PWM pins
are configured as outputs. Changing the polarity
configuration while the PWM pins are configured as
outputs is not recommended, since it may result in
damage to the application circuits.
The P1A, P1B, P1C and P1D output latches may not be
in the proper states when the PWM module is initialized.
Enabling the PWM pins for output at the same time as
the ECCP1 module may cause damage to the applica-
tion circuit. The ECCP1 module must be enabled in the
proper output mode and complete a full PWM cycle
before configuring the PWM pins as outputs. The
TMR2IF bit being set as the second PWM period begins.
Event Clears
Event Clears
Shutdown
Shutdown
START-UP CONSIDERATIONS
Cleared by
ECCPASE
Firmware
© 2009 Microchip Technology Inc.
Resumes
Resumes
PWM
PWM