5.3 Host Commands
C141-E192-01EN 5-59
(21) READ BUFFER (X’E4’)
The host system can read the current contents of the data buffer of the device by
issuing this command. Upon receipt of this command, the device sets the BSY bit
of Status register and sets up for a read operation. Then the device sets the DRQ
bit of Status register, clears the BSY bit, and generates an interrupt. After that,
the host system can read up to 512 bytes of data from the buffer.
At command issuance (I/O registers setting contents)
1F7
H
(CM) 11110100
1F6
H
(DH) x x x DV xx
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(FR)
xx
xx
xx
xx
xx
At command completion (I/O registers contents to be read)
1F7
H
(ST) Status information
1F6
H
(DH) x x x DV xx
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(ER)
xx
xx
xx
xx
Error information
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