mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 974

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Memory Map/Register Definitions
39.4.18 Frame Number Register High (USBx_FRMNUMH)
The Frame Number Register (Low and High) contains an 11-bit value used to compute
the address where the current Buffer Descriptor Table (BDT) resides in system memory.
Addresses: USB0_FRMNUMH is FFFF_9000h base + A4h offset = FFFF_90A4h
974
FRM[10:8]
Reserved
FRM[7:0]
Field
Reset
Field
7–0
Read
7–3
2–0
Write
Bit
This 8-bit field and the 3-bit field in the Frame Number Register High are used to compute the address
where the current Buffer Descriptor Table (BDT) resides in system memory.
This read-only bitfield is reserved and always has the value zero.
This 3-bit field and the 8-bit field in the Frame Number Register Low are used to compute the address
where the current Buffer Descriptor Table (BDT) resides in system memory.
7
0
0
6
MCF51JF128 Reference Manual, Rev. 2, 03/2011
USBx_FRMNUMH field descriptions
USBx_FRMNUML field descriptions
0
0
5
Preliminary
0
4
Description
Description
0
3
0
2
Freescale Semiconductor, Inc.
FRM[10:8]
0
1
0
0