Information

PIC16C745/765
DS80114C-page 2  2002 Microchip Technology Inc.
2. Module: USTAT Register
The TOK_DNE bit (UIR Bit 3) is not set correctly for
pending USB transactions in the USTAT register (see
Figure 2). If additional transactions arrive prior to
clearing the TOK_DNE bit, they will be lost.
Work around
The interrupt driver Microchip firmware does not lose
any transactions with current operating systems.
FIGURE 2: UIR / USTAT REGISTER
USTAT
QUEUE
not empty
TOK_DNE bit
UIR
FIFO