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CHAPTER 30 USB Mini-host
■ Host State Status Register (HSTATE)
Figure 30.4-5 Bit Configuration of the Host State Status Register (HSTATE)
7
6
Reserved Reserved
ALIVE
-
-
X
: undefined value
R/W
: Readable and writable
: Initial value
Bit7-6
Bit5
784
6
6
6
6
CLKSEL SOFBUSY
SUSP
TMODE
R/W
R/W
R/W
R/W
R/W
Bit names
Reserved
• Do not use
ALIVE
• This bit activates the Keep-Alive function in Low Speed
• If enabled and If HSTATE:CLKSEL is set to "0", a SE0
6
6
Initial Value:
xx010010
B
CSTAT
R/W
bit0
CSTAT
0
0
Device is disconnected
1
Device is connected
bit1
TMODE
0
Low speed
Full speed
1
bit2
SUSP
0
Resume operation
Suspend host operation
1
bit3
SOFBUSY
0
SOF timer is idle
SOF timer is busy
1
bit4
CLKSEL
0
Clock set for low speed USB
1
Clock set for full speed USB
bit5
ALIVE
0
SOF is output
1
SE0 output (Keep Alive)
bit6 to 7
Reserved
0
Always write "0" to this bit
Mode.
token will be output instead of a SOF. If, meanwhile, the
CLKSEL bit toggle to "1", a SOF will be output regardless
of the setting of the ALIVE bit.
Connection status bit
Transfer Mode bit
Suspend bit
SOF timer operation bit
Clock Selection bit
Keep Alive bit
Reserved
Function
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