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PIC18F4550ESOSQTP bảng dữ liệu(PDF) 181 Page - Microchip Technology

tên linh kiện PIC18F4550ESOSQTP
Giải thích chi tiết về linh kiện  28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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© 2007 Microchip Technology Inc.
Preliminary
DS39632D-page 179
PIC18F2455/2550/4455/4550
17.5.1.1
Bus Activity Detect Interrupt Bit
(ACTVIF)
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
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.
EXAMPLE 17-1:
CLEARING ACTVIF BIT (UIR<2>)
Assembly:
BCF
UCON, SUSPND
LOOP:
BTFSS
UIR, ACTVIF
BRA
DONE
BCF
UIR, ACTVIF
BRA
LOOP
DONE:
C:
UCONbits.SUSPND = 0;
while (UIRbits.ACTVIF) { UIRbits.ACTVIF = 0; }



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