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Memory map/Register definitions
Field
7–1
Provides address bits 15 through 9 of the BDT base address.
BDTBA
0
This field is reserved.
Reserved
This read-only field is reserved and always has the value 0.
33.5.13 Frame Number register Low (USBx_FRMNUML)
The Frame Number registers (low and high) contain the 11-bit frame number. These
registers are updated with the current frame number whenever a SOF TOKEN is
received.
Address: 4007_2000h base + A0h offset = 4007_20A0h
Bit
7
Read
Write
Reset
0
Field
FRM[7:0]
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.
33.5.14 Frame Number register High (USBx_FRMNUMH)
The Frame Number registers (low and high) contain the 11-bit frame number. These
registers are updated with the current frame number whenever a SOF TOKEN is
received.
Address: 4007_2000h base + A4h offset = 4007_20A4h
Bit
7
Read
Write
Reset
0
Field
7–3
This field is reserved.
Reserved
This read-only field is reserved and always has the value 0.
FRM[10:8]
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.
552
USBx_BDTPAGE1 field descriptions
6
5
0
0
USBx_FRMNUML field descriptions
6
5
0
0
0
USBx_FRMNUMH field descriptions
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
Description
4
3
FRM[7:0]
0
0
Description
4
3
0
0
Description
2
1
0
0
2
1
FRM[10:8]
0
0
Freescale Semiconductor, Inc.
0
0
0
0
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