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IDLE (X'97' or X'E3')
Upon receipt of this command, the device sets the BSY bit of the Status register, and enters the
idle mode. Then, the device clears the BSY bit, and generates an interrupt. The device generates
an interrupt even if the device has not fully entered the idle mode. If the spindle of the device is
already rotating, the spin-up sequence shall not be implemented.
If the contents of the Sector Count register is other than 0, the automatic power-down function is
enabled and the timer starts countdown immediately. When the timer reaches the specified time,
the device enters the standby mode.
If the contents of the Sector Count register is 0, the automatic power-down function is disabled.
Enabling the automatic power-down function means that the device automatically enters the
standby mode after a certain period of time. When the device enters the idle mode, the timer
starts countdown. If any command is not issued while the timer is counting down, the device
automatically enters the standby mode. If any command is issued while the timer is counting
down, the timer is initialized and the command is executed. The timer restarts countdown after
completion of the command execution.
The period of timer count is set depending on the value of the Sector Count register as shown
below.
Sector Count register value
0
[X'00']
1 to 240
[X'01' to X'F0']
241 to 251 [X'F1' to X'FB']
252
[X'FC']
253
[X'FD']
254 to 255 [X'FE' to X'FF']
At command issuance (I/O registers setting contents)
1F7
(CM)
H
1F6
(DH)
H
1F5
(CH)
H
1F4
(CL)
H
1F3
(SN)
H
1F2
(SC)
H
1F1
(FR)
H
Disable of timer
(Value ×5) seconds
(Value – 240) ×30 minutes
21 minutes
8 hours
21 minutes 15 seconds
X'97' or X'E3'
×
×
×
DV
xx
xx
xx
Period of timer
xx
C141-E106-01EN
Point of timer
xx
5 - 43
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