Queued Serial Peripheral Interface (QSPI)
Freescale Semiconductor
25-6
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
25.3.3
QSPI Wrap Register (QWR)
The QSPI wrap register provides halt transfer control, wraparound settings, and queue pointer locations.
25.3.4
QSPI Interrupt Register (QIR)
The QIR contains QSPI interrupt enables and status flags.
IPSBAR
Offset:
0x00_0348 (QWR)
Access: User read/write
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
HALT WREN WRTO CSIV
ENDQP
CPTQP
NEWQP
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 25-5. QSPI Wrap Register (QWR)
Table 25-5. QWR Field Descriptions
Field
Description
15
HALT
Halt transfers. Assertion of this bit causes the QSPI to stop execution of commands after it has completed execution
of the current command.
14
WREN
Wraparound enable. Enables wraparound mode.
0 Execution stops after executing the command pointed to by QWR[ENDQP].
1 After executing command pointed to by QWR[ENDQP], wrap back to entry zero, or the entry pointed to by
QWR[NEWQP] and continue execution.
13
WRTO
Wraparound location. Determines where the QSPI wraps to in wraparound mode.
0 Wrap to RAM entry zero.
1 Wrap to RAM entry pointed to by QWR[NEWQP].
12
CSIV
QSPI_CS inactive level.
0 QSPI chip select outputs return to zero when not driven from the value in the current command RAM entry during
a transfer (that is, inactive state is 0, chip selects are active high).
1 QSPI chip select outputs return to one when not driven from the value in the current command RAM entry during
a transfer (that is, inactive state is 1, chip selects are active low).
11–8
ENDQP
End of queue pointer. Points to the RAM entry that contains the last transfer description in the queue.
7–4
CPTQP
Completed queue entry pointer. Points to the RAM entry that contains the last command to have been completed.
This field is read only.
3–0
NEWQP
Start of queue pointer. This 4-bit field points to the first entry in the RAM to be executed on initiating a transfer.
IPSBAR
Offset:
0x00_034C (QIR)
Access: User read/write
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
WCEFB ABRTB
0
ABRTL WCEFE ABRTE
0
SPIFE
0
0
0
0
WCEF ABRT
0
SPIF
W
w1c
w1c
w1c
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 25-6. QSPI Interrupt Register (QIR)
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MCF52234CVM60,
MCF52235CVM60
