7 usb transmitted packet counter register (txpcnt), 8 usb counter overflow register (cntovr), Usb counter overflow register (cntovr) -26 – Freescale Semiconductor MCF5480 User Manual
Page 900
MCF548x Reference Manual, Rev. 3
29-26
Freescale Semiconductor
29.2.3.7
USB Transmitted Packet Counter Register (TXPCNT)
29.2.3.8
USB Counter Overflow Register (CNTOVR)
The CNTOVR tracks overflow of each of the counter registers described above. When a counter overflow
occurs, the appropriate bit in this register is set, and the USBAISR[CTROVFL] bit is set. Writing to any
of the counters will result in the corresponding overflow bit being cleared as well.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
TXPCNT
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg
Addr
MBAR + 0xB08C
Figure 29-24. USB Transmitted Packet Counter Register (TXPCNT)
Table 29-24. TXPCNT Field Descriptions
Bits
Name
Description
15–0
TXPCNT
Transmitted packet counter. This register counts the number of packets transmitted by the
USB.
7
6
5
4
3
2
1
0
R
0
TXP
CNT
FRME
CNT
PIDE
CNT
BSE
CNT
CRCE
CNT
DP
CNT
PP
CNT
W
Reset
0
0
0
0
0
0
0
0
Reg
Addr
MBAR + 0xB08E
Figure 29-25. USB Counter Overflow Register (CNTOVR)
Table 29-25. CNTOVR Field Descriptions
Bits
Name
Description
7
—
Reserved, should be cleared.
6
TXPCNT
Transmitted packet counter overflow flag.
0 The transmitted packet counter has not overflowed.
1 The transmitted packet counter has overflowed.
5
FRMECNT Framing error counter overflow flag.
0 The framing error counter has not overflowed.
1 The framing error counter has overflowed.
4
PIDECNT
PID error counter overflow flag.
0 The PID error counter has not overflowed.
1 The PID error counter has overflowed.