NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 685 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
Control Endpoint In Transfer Data Count (USBD_CEPTXCNT)
Register
Offset
R/W Description
Reset Value
USBD_CEPTXCNT
0x038
R/W Control Endpoint In Transfer Data Count
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
TXCNT
Bits
Description
[31:8]
Reserved
Reserved.
[7:0]
TXCNT
In-transfer Data Count
There is no mode selection for the control endpoint (but it operates like manual
mode).The local-CPU has to fill the control-endpoint buffer with the data to be sent for
an in-token and to write the count of bytes in this register. When zero is written into
this field, a zero length packet is sent to the host. When the count written in the
register is more than the MPS, the data sent will be of only MPS.