Motorola ColdFire MCF5281 - Manual (Page 408)

Queued Serial Peripheral Interface (QSPI)
22-4 Freescale Semiconductor
Table 22-3. QMR Field Descriptions
Field Description
15
MSTR
Master mode enable.
0 Reserved, do not use.
1 The QSPI is in master mode. Must be set for the QSPI module to operate correctly.
14 Reserved, must be cleared.
13–10
BITS
Transfer size. Determines the number of bits to be transferred for each entry in the queue.
9
CPOL
Clock polarity. Defines the clock polarity of QSPI_CLK.
0 The inactive state value of QSPI_CLK is logic level 0.
1 The inactive state value of QSPI_CLK is logic level 1.
8
CPHA
Clock phase. Defines the QSPI_CLK clock-phase.
0 Data captured on the leading edge of QSPI_CLK and changed on the following edge of QSPI_CLK.
1 Data changed on the leading edge of QSPI_CLK and captured on the following edge of QSPI_CLK.
7–0
BAUD
Baud rate divider. The baud rate is selected by writing a value in the range 2–255. A value of zero disables the QSPI.
A value of 1 is an invalid setting. The desired QSPI_CLK baud rate is related to the internal bus clock and
QMR[BAUD] by the following expression:
QMR[BAUD] = f
sys/
/ (2 ×
[desired QSPI_CLK baud rate])
BITS Bits per Transfer
0000 16
0001–0111 Reserved
1000 8
1001 9
1010 10
1011 11
1100 12
1101 13
1110 14
1111 15
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3