m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 204

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 2.8.45. USB ISO control register
USB ISO Control register
(b15)
0 0 0 0 0 0 0 0 0 0 0
b7
•Artificial SOF enable bit
•Artificial SOF status flag
•Artificial SOF status clear bit
The configuration of USB ISO control register is shown in Figure 2.8.45.
This bit enables the artificial SOF function.
With this bit being set to “1”, when a SOF packet from the host PC has been destroyed due to any
cause and no valid SOF packet has been received even after 1ms from the preceding start of the
frame, the artificial SOF receive is operated. (And the USB SOF interrupt request, also, occurs.)
Therefore, even if the SOF packet is destroyed due to any cause, a new frame can be formed by this
function without waiting for the next SOF packet. The artificial SOF receive function is operated once
after the valid SOF packet is received twice.
This flag is the artificial SOF function status flag.
This flag is valid when the artificial SOF function has been enabled (Artificial SOF enable bit is “1”).
With this flag being set to “1”, an artificial SOF receive has occurred by the artificial SOF function.
This flag is cleared by setting “1” to CLR_ART_SOF bit .
Artificial SOF status flag is cleared to “0” by setting “1” to this bit.
(b8)
b0
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b7
b0
AUTO_FL
ISO_UPD
ART_SOF_ENA
ART_SOF_SET
CLR_ART_SOF
Reserved
Note 1: Read only.
Note 2: Always read “0”.
Bit Symbol
Symbol
USBISOC
Auto flush bit
ISO Update bit
Artificial SOF enable bit
Artificial SOF set flag
Clear artificial SOF set flag
Bit Name
Address
028C
16
0 : Hardware auto flush disabled
1 : Hardware auto flush enabled
0 : ISO update disabled
1 : ISO update enabled
0 : Artificial SOF disabled
1 : Artificial SOF enabled
0 : Not generated by device (Note 1)
1 : Generated by the device
0 : No action
1 : Clear ART_SOF_SET flag
Must always be “0”
Function
When reset
0000
16
2. USB function
(Note 2)
O O
O O
O O
O O
O O
R W
O X