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■ CONT4
The CONT4 register is used to set each end point into the USB busy status. The address of the
CONT4 register is 0006_0028
Figure 17.2-18 shows the CONT4 register.
15
Address:0006-0028
H
Table 17.2-11 lists the bits of the CONT4 register and their functions.
Table 17.2-11 Bits of the CONT4 Register
Bit name
FIFOBUSY
(n: 0o, 0i, 1
to 3)
To perform transfer by CPU access, the NACK handshake can always be returned in response to
a token from the HOST when 0 is written to FIFOBUSYn. Always write 0 to this bit for DMA
transfer.
.
H
Figure 17.2-18 CONT4 Register
14
13
12
11
10
9
Polarity
This bit is used to set end point n into the busy
ActiveLow
status.
8
7
6
5
4
3
F
F
I
I
F
F
O
O
B
B
U
U
S
S
Y
Y
3
2
R/W R/W R/W R/W R/W
Function
CHAPTER 17 USB FUNCTION
2
1
0
Initial value
F
F
F
I
I
I
F
F
F
O
O
O
B
B
B
XXXXXXXXXXX00000
U
U
U
S
S
S
Y
Y
Y
1
0
0
i
o
B
399
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