National CP3BT26 User Manual
177
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CP3
BT26
23.2
MASTER MODE
In Master mode, the MSK pin is an output for the shift clock,
MSK. When data is written to the MWDAT register, eight or
sixteen MSK clocks, depending on the mode selected, are
MSK. When data is written to the MWDAT register, eight or
sixteen MSK clocks, depending on the mode selected, are
generated to shift the 8 or 16 bits of data, and then MSK
goes idle again. The MSK idle state can be either high or
low, depending on the SCIDL bit.
goes idle again. The MSK idle state can be either high or
low, depending on the SCIDL bit.
Figure 85.
Normal Mode (SCIDL = 0)
Figure 86.
Normal Mode (SCIDL = 1)
Figure 87.
Alternate Mode (SCIDL = 0)
Figure 88.
Alternate Mode (SCIDL = 1)
Bit 0
(LSB)
Bit 1
MSB - 2
MSB - 1
MSK
End of Transfer
Sample
Point
Point
Shift
Out
Out
Data Out
MSB
Bit 0
(LSB)
Bit 1
MSB - 2
MSB - 1
Data In
MSB
DS069
Bit 0
(LSB)
Bit 1
MSB - 2
MSB - 1
MSK
End of Transfer
Data Out
MSB
Bit 0
(LSB)
Bit 1
MSB - 2
MSB - 1
Data In
MSB
Sample
Point
Point
Shift
Out
Out
DS070
Bit 0
(LSB)
Bit 1
MSB - 2
MSB - 1
MSK
End of Transfer
Data Out
MSB
Bit 0
(LSB)
Bit 1
MSB - 2
MSB - 1
Data In
MSB
Sample
Point
Point
Shift
Out
Out
DS071
Bit 0
(LSB)
Bit 1
MSB - 2
MSB - 1
MSK
End of Transfer
Sample
Point
Point
Shift
Out
Out
Data Out
MSB
Bit 0
(LSB)
Bit 1
MSB - 2
MSB - 1
Data In
MSB
DS072