28-14
MC9328MX1 Reference Manual
MOTOROLA
USB Device Port
28.3.6 USB Descriptor RAM/Endpoint Buffer Data Register
This register allows user access to the endpoint buffer download facility. For endpoint buffer access, when
the CFG bit in the USB_DADR register is set, writes to this register cause the data to be loaded into the
UDC module’s endpoint buffers, and reads are undefined. When the CFG bit in the USB_DADR register is
cleared, writes have no effect and reads are zero.
Access to this register is allowed only when the USB_ENA bit in the USB Control Register (USB_CTRL)
is set to 0. Access at other times is ignored and reads are undefined.
USB_DDAT
USB Descriptor RAM/Endpoint Buffer
Data Register
Addr
0x00212014
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DDAT
TYPE
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 28-10. USB Descriptor RAM/Endpoint Buffer Data Register Description
Name
Description
Reserved
Bits 31–8
Reserved—These bits are reserved and should read 0.
DDAT
Bits 7–0
DDAT
—Allows user access to the endpoint buffer in the UDC module when the endpoint
configuration is happening. (When the CFG bit in the USB_DADR is set) Writing to this field loads the
data written into the UDC endpoint buffers.
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