
26 USB
250
EPSON
S1C38000 TECHNICAL MANUAL
USB[74h] Index[02h] bits 7–0, Index[03h] bits 7–0 Product ID Bits [15:0]
This register determines the Product ID during a “Get Device Descriptor” request.
USB[74h] Index[04h] bits 7–0, Index[05h] bits 7–0 Release Number Bits [15:0]
This register determines the device release number during a “Get Device Descriptor”
request.
bits 5–0
Receive FIFO Almost Full Threshold Bits [5:0]
This register determines the threshold at which the receive FIFO almost full status bit is
set.
Note: The Receive FIFO Almost Full threshold must be set less than 64 in order to cause an
interrupt, as the FIFO count must rise above the threshold to cause an interrupt.
bits 5–0
Transmit FIFO Almost Empty Threshold Bits [5:0]
This register determines the threshold at which the transmit FIFO almost empty status
bit is set.
Note: The Transmit FIFO Almost Empty threshold must be set greater than zero in order to
cause an interrupt, as the FIFO count must drop below the threshold to cause an
interrupt.
Product ID MSB
USB[74h], Index[02h] Default = 0000 0088h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
Product ID Bits [15:8]
15
14
13
12
11
10
98
76543210
Product ID LSB
USB[74h], Index[03h] Default = 0000 0021h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
Product ID Bits [7:0]
15
14
13
12
11
10
98
76543210
Release Number MSB
USB[74h], Index[04h] Default = 0000 0001h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
Release Number Bits [15:8]
15
14
13
12
11
10
98
76543210
Release Number LSB
USB[74h], Index[05h] 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
Release Number Bits [7:0]
15
14
13
12
11
10
98
76543210
Receive FIFO Almost Full Threshold
USB[74h], Index[06h] Default = 0000 003Ch
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
Receive FIFO Almost Full Threshold
15
14
13
12
11
10
98
76543210
Transmit FIFO Almost Empty Threshold
USB[74h], Index[07h] Default = 0000 0004h
Read/Write
n/a
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
Transmit FIFO Almost Empty Threshold
15
14
13
12
11
10
98
76543210