Circuit Board Reference Manual

Memory Map/Register Definition

MCF548x Reference Manual, Rev. 3

Freescale Semiconductor 29-23

29.2.3 USB Counter Registers

The USB module contains a number of registers that keep statistics on the number of packets that have

been received and transmitted along with the number of errors.

29.2.3.1 USB Packet Passed Count Register (PPCNT)

1514131211109876543210

R IFNUM ALTSET

Reset0000000000000000

Reg

Addr

MBAR + 0xB040 (IFR0); 0xB042 (IFR1); 0xB044 (IFR2), 0xB046 (IFR4); 0xB048 (IFR5); 0xB04A (IFR6);

0xB04C (IFR7); 0xB04E (IFR8); 0xB050 (IFR9); 0xB052 (IFR10); 0xB054 (IFR11); 0xB056 (IFR12); 0xB058 (IFR13);

0xB05A (IFR14); 0xB05C (IFR15); 0xB05E (IFR16); 0xB060 (IFR17); 0xB062 (IFR18); 0xB064 (IFR19);

0xB066 (IFR20); 0xB068 (IFR21); 0xB06A (IFR22); 0xB06C (IFR23); 0xB06E (IFR24); 0xB070 (IFR25);

0xB072 (IFR26); 0xB074 (IFR27); 0xB076 (IFR28); 0xB078 (IFR29); 0xB07A (IFR30); 0xB07C (IFR31)

Figure 29-17. USB Configuration Interface Register (IFRn)

Table 29-17. IFRn Field Descriptions

Bits Name Description

15–8 IFNUM Interface number

7–0 ALTSET Alternate setting. After a write to the IFUR, if IFUR[IFNUM] matches a IFRn[IFNUM] field,

then this value is updated with the data from IFUR[ALTSET].

1514131211109876543210

R PPCNT

Reset0000000000000000

Reg

Addr

MBAR + 0xB080

Figure 29-18. USB Packet Passed Count Register (PPCNT)

Table 29-18. PPCNT Field Descriptions

Bits Name Description

15–0 PPCNT Packet passed counter. This register counts the number of packets that have been

received successfully by the USB.