
26 USB
252
EPSON
S1C38000 TECHNICAL MANUAL
bit 2
EP3 Data Toggle Mode
When set, this bit resets the Data Toggle bit to zero at the end of a USB transfer to EP3.
When cleared, the Data Toggle bit strictly toggles.
Note: When the Data Toggle mode is set to 0, the EP3 toggles every EP3 transfer if the transfer
size matches the maximum transfer size for EP3. If the transfer size is less than the
maximum packet size, then the EP3 Data Toggle bit is set to 0.
bit 0
EP1 Data Toggle Mode
When set, this bit resets the Data Toggle bit to zero at the end of a USB transfer to EP1.
When cleared, the Data Toggle bit strictly toggles.
Note: When the Data Toggle mode is set to 0, the EP1 toggles every EP1 transfer if the transfer
size matches the maximum transfer size for EP1. If the transfer size is less than the
maximum packet size, then the EP1 Data Toggle bit is set to 0.
bit 0
reserved
This bit must be set to 0.
bit 0
Transmit FIFO Valid Mode
When set, this bit causes a NAK response to a host read request from the transmit FIFO
(EP4) unless the FIFO Valid bit (in register USB[58h] bit 5) is set. When this bit is
cleared, any data waiting in the transmit FIFO will be sent in response to a USB host
read request, and the FIFO Valid bit is ignored.
These bits control inputs to the USB module.
bit 6
USCMPEN
This bit controls the USB differential input receiver.
0
Differential input receiver disabled
1
Differential input receiver enabled
bit 5
reserved
This bit must be set to 0.
bit 4
reserved
This bit must be set to 0.
Reserved
USB[74h], Index[0Bh] Default = 0000 0000h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
reserved
15
14
13
12
11
10
98
7654321
0
FIFO Control
USB[74h], Index[0Ch] Default = 0000 0000h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
Transmit
FIFO
Valid
Mode
15
14
13
12
11
10
98
7654321
0
USBFC Input Control Register
USB[80h]
Default = 0000 000Dh
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
USCMPEN reserved reserved
ISO
WAKEUP reserved
reserved
15
14
13
12
11
10
98
76
54321
0