R8A66597BG RENESAS [Renesas Technology Corp], R8A66597BG Datasheet - Page 125

• Manufacturer Part Number: R8A66597BG
• Description: ASSP (USB2.0 2 Port Host/1 Port Peripheral Controller)
• Manufacturer: RENESAS [Renesas Technology Corp]

R8A66597FP/DFP/BG
3.2.8
R e v 1 . 0 1
µ
µ
Frame Number
(FRNM bit)
(1) Peripheral C ontroller Function: e xa mple of SOFR interrupt generated after
SOFR Interrupt
(2) Peripheral C ontroller Function: e xa mple of SOFR interrupt generated before
µ
µ
Frame Number
(FRNM bit)
µ
SOFR Interrupt
SOF Packet
SOF Number
SOF Packet
SOF Number
SOF Lock
Frame Number Update Interrupt
Figure 3.12 shows an example of the R8A66597 SOFR interrupt output timing.
In the Peripheral Controller function, when the controller detects a new SOF packet in Full-Speed operation, it updates
the frame number and generates an SOFR interrupt. In Hi-Speed operation, when an SOF packet with a different
frame number is detected after the controller goes to the µSOF lock state, the controller updates the FRNM bit and
generates the SOFR interrupt. The SOF interpolation function also runs in Hi-Speed operation after going to the µSOF
locked state. The µSOF locked state means that two µSOF packets with different frame numbers are received without
errors.
The µSOF lock monitor start and stop conditions are as follows.
(1) µSOF lock monitor start conditions
(2) µSOF lock monitor stop conditions
O c t 1 7 , 2 0 0 8
"USBE=1" and internal clock is supplied
"USBE=0", USB bus reset is received, or suspend is detected
6
7
µ
SOF falling
7
3
0
No interrupt output
µ
generated
due to no lock
SOF interpolation not
p a g e 1 2 5 o f 1 8 3
0
1
Figure 3.12 SOFR Interrupt Output Timing Example
0 (value befo re
1
2
6
µ
SOF falling
µ
3
7
SOF lock)
µ
SOF falling
µ
generated
SOF interpolation not
4
0
µ
generated
No interrupt output
SOF interpolation
due to no lock
5
6
7
7
0
µ
SOF falling
0
1
4
µ
generated
SOF interpolation
Interrupt output by
SOF interpolation function
1
µ
SOF Lock
µ
SOF Lock
2
7
µ
SOF falling
3
0
µ
generated
SOF interpolation
Interrupt output by
SOF interpolation function
4
4
1
5
2
6
7
7
0
0
6
1
6
1