Endpoint N Last Read Frame Pointer Registers; Table 28-20 Endpoint N Last Read Frame Pointer Registers Description - Motorola DragonBall MC9328MX1 Reference Manual

USB Device Port

28.3.16 Endpoint n Last Read Frame Pointer Registers

The Endpoint n Last Read Frame Pointer Registers hold the location of the most recently read frame or the
start of the frame currently in transmission.
The number of Endpoint n Last Read Frame Pointer Registers in the MC9328MX1 depends on the number
of endpoints configured.
USB_EP0_LRFP
USB_EP1_LRFP
USB_EP2_LRFP
USB_EP3_LRFP
USB_EP4_LRFP
USB_EP5_LRFP
BIT 31 30 29
TYPE r r r
0 0 0
RESET
BIT 15 14 13
TYPE r r r
0 0 0
RESET
Table 28-20. Endpoint n Last Read Frame Pointer Registers Description
Name
Reserved Reserved—These bits are reserved and should read 0.
Bits 31–6
LRFP Last Read Frame Pointer—Indicates the start of the most recently read frame or the start of the
Bits 5–0 frame currently in transmission. The LRFP can be read and written for debugging purposes. For the
frame retransmit function, the LRFP indicates the point to begin retransmission of the data frame.
There are no safeguards to prevent retransmitting data that was overwritten. When the FRAME bit is
not set, this pointer has no meaning.
28-30
Endpoint 0 Last Read Frame Pointer Register
Endpoint 1 Last Read Frame Pointer Register
Endpoint 2 Last Read Frame Pointer Register
Endpoint 3 Last Read Frame Pointer Register
Endpoint 4 Last Read Frame Pointer Register
Endpoint 5 Last Read Frame Pointer Register
28 27 26 25
r r r r
0 0 0 0
12 11 10 9
r r r r
0 0 0 0
MC9328MX1 Reference Manual
24 23 22 21 20
r r r r r
0 0 0 0 0
0x0000
8 7 6 5 4
r r r rw rw
0 0 0 0 0
0x0000
Description
Addr
0x00212048
0x00212078
0x002120A8
0x002120D8
0x00212108
0x00212138
19 18 17 16
r r r r
0 0 0 0
3 2 1 0
LRFP
rw rw rw rw
0 0 0 0
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