CY7C68053
Document # 001-06120 Rev *F
Page 4 of 39
pushes the program counter onto its stack then jumps to
address 0x0043, where it expects to find a ‘jump’ instruction to
the USB interrupt service routine.
The FX2LP18 jump instruction is encoded as shown in
Table 3-2
.
If Autovectoring is enabled (AV2EN = 1 in the INTSET-UP
register), the FX2LP18 substitutes its INT2VEC byte.
Therefore, if the high byte (‘page’) of a jump-table address is
preloaded at location 0x0044, the automatically-inserted
INT2VEC byte at 0x0045 directs the jump to the correct
address out of the 27 addresses within the page.
Table 3-2. INT2 USB Interrupts
USB INTERRUPT TABLE FOR INT2
Priority
INT2VEC Value
Source
Notes
1
00
SUDAV
Set-up Data Available
2
04
SOF
Start of Frame (or microframe)
3
08
SUTOK
Set-up Token Received
4
0C
SUSPEND
USB Suspend request
5 10
USB
RESET
Bus
reset
6 14
HISPEED Entered
high-speed
operation
7
18
EP0ACK
FX2LP18 ACK’d the CONTROL Handshake
8 1C
Reserved
9
20
EP0-IN
EP0-IN ready to be loaded with data
10 24
EP0-OUT EP0-OUT has USB data
11
28
EP1-IN
EP1-IN ready to be loaded with data
12
2C
EP1-OUT
EP1-OUT has USB data
13
30
EP2
IN: buffer available. OUT: buffer has data
14
34
EP4
IN: buffer available. OUT: buffer has data
15
38
EP6
IN: buffer available. OUT: buffer has data
16
3C
EP8
IN: buffer available. OUT: buffer has data
17
40
IBN
IN-Bulk-NAK (any IN endpoint)
18 44
Reserved
19
48
EP0PING
EP0 OUT was Pinged and it NAK’d
20 4C
EP1PING EP1
OUT
was Pinged and it NAK’d
21 50
EP2PING EP2
OUT
was Pinged and it NAK’d
22 54
EP4PING EP4
OUT
was Pinged and it NAK’d
23 58
EP6PING EP6
OUT
was Pinged and it NAK’d
24 5C
EP8PING EP8
OUT
was Pinged and it NAK’d
25
60
ERRLIMIT
Bus errors exceeded the programmed limit
26 64
27 68
Reserved
28 6C
Reserved
29
70
EP2ISOERR
ISO EP2 OUT PID sequence error
30
74
EP4ISOERR
ISO EP4 OUT PID sequence error
31
78
EP6ISOERR
ISO EP6 OUT PID sequence error
32
7C
EP8ISOERR
ISO EP8 OUT PID sequence error
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