MCF5282CVM66 Freescale, MCF5282CVM66 Datasheet - Page 417
MCF5282CVM66
Manufacturer Part Number
MCF5282CVM66
Description
Manufacturer
Freescale
Datasheet
1.MCF5282CVM66.pdf
(766 pages)
Specifications of MCF5282CVM66
Cpu Family
MCF528x
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
66MHz
Interface Type
CAN/I2C/QSPI/UART
Total Internal Ram Size
64KB
# I/os (max)
150
Number Of Timers - General Purpose
12
Operating Supply Voltage (typ)
3.3V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
256
Package Type
MA-BGA
Program Memory Type
Flash
Program Memory Size
512KB
Lead Free Status / RoHS Status
Compliant
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The desired QSPI_CLK baud rate is related to the internal bus clock and QMR[BAUD] by the following
expression:
22.4.3
The QSPI supports programmable delays for the QSPI_CS signals before and after a transfer. The time
between QSPI_CS assertion and the leading QSPI_CLK edge, and the time between the end of one transfer
and the beginning of the next, are both independently programmable.
The chip select to clock delay enable bit in the command RAM, QCR[DSCK], enables the programmable
delay period from QSPI_CS assertion until the leading edge of QSPI_CLK. QDLYR[QCD] determines the
period of delay before the leading edge of QSPI_CLK. The following expression determines the actual
delay before the QSPI_CLK leading edge:
QDLYR[QCD] has a range of 1–127.
When QDLYR[QCD] or QCR[DSCK] equals zero, the standard delay of one-half the QSPI_CLK period
is used.
The command RAM delay after transmit enable bit, QCR[DT], enables the programmable delay period
from the negation of the QSPI_CS signals until the start of the next transfer. The delay after transfer can
be used to provide a peripheral deselect interval. A delay can also be inserted between consecutive
transfers to allow serial A/D converters to complete conversion. There are two transfer delay options: the
user can choose to delay a standard period after serial transfer is complete or can specify a delay period.
Writing a value to QDLYR[DTL] specifies a delay period. QCR[DT] determines whether the standard
delay period (DT = 0) or the specified delay period (DT = 1) is used. The following expression is used to
calculate the delay when DT equals 1:
Freescale Semiconductor
Table 22-10. QSPI_CLK Frequency as Function of Internal Bus Clock and Baud Rate
Transfer Delays
Delay after transfer
QMR[BAUD]
QSPI_CS-to-QSPI_CLK delay
QMR [BAUD]
255
16
32
2
4
8
=
Internal Bus Clock = 80 MHz
-----------------------------------------------------------------------------------
2
=
×
32
----------------------------------------------- -
[desired QSPI_CLK baud rate]
×
QDLYR[DTL]
f
sys
=
f
sys
QDLYR[QCD]
------------------------------------ -
QSPI_CLK
f
156.9 kHz
sys
2.5 MHz
20 MHz
10 MHz
1.25 Hz
5 MHz
(DT = 1)
Queued Serial Peripheral Interface (QSPI)
Eqn. 22-1
Eqn. 22-2
Eqn. 22-3
22-13
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