PIC18LF2455T-I/SO Microchip Technology, PIC18LF2455T-I/SO Datasheet - Page 184

• Manufacturer Part Number: PIC18LF2455T-I/SO
• Description: IC PIC MCU FLASH 12KX16 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18LF2455T-I/SO

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 24KB (12K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Processor Series: PIC18LF
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 2048 B
• Interface Type: SPI, I2C, EAUSART
• Maximum Clock Frequency: 48 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 1 x 8
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 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, ICE4000, DM163014, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 10 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F2455/2550/4455/4550
17.5.1.1
The ACTVIF bit cannot be cleared immediately after
the USB module wakes up from Suspend or while the
USB module is suspended. A few clock cycles are
required to synchronize the internal hardware state
machine before the ACTVIF bit can be cleared by
firmware. Clearing the ACTVIF bit before the internal
hardware is synchronized may not have an effect on
the value of ACTVIF. Additionally, if the USB module
uses the clock from the 96 MHz PLL source, then after
clearing the SUSPND bit, the USB module may not be
EXAMPLE 17-1:
DS39632E-page 182
Assembly:
BCF
Loop:
BCF
BTFSC UIR, ACTVIF
BRA
Done:
C:
UCONbits.SUSPND = 0;
while (UIRbits.ACTVIF) { UIRbits.ACTVIF = 0; }
UCON, SUSPND
UIR, ACTVIF
Loop
Bus Activity Detect Interrupt Bit
(ACTVIF)
CLEARING ACTVIF BIT (UIR<2>)
immediately operational while waiting for the 96 MHz
PLL to lock. The application code should clear the
ACTVIF flag as shown in Example 17-1.
Note:
Only one ACTVIF interrupt is generated
when resuming from the USB bus Idle
condition. If user firmware clears the
ACTVIF bit, the bit will not immediately
become set again, even when there is
continuous bus traffic. Bus traffic must
cease long enough to generate another
IDLEIF condition before another ACTVIF
interrupt can be generated.
© 2009 Microchip Technology Inc.