MCF5282CVM66 Freescale, MCF5282CVM66 Datasheet - Page 414
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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Queued Serial Peripheral Interface (QSPI)
The RAM is organized so that 1 byte of command control data, 1 word of transmit data, and 1 word of
receive data comprise 1 of the 16 queue entries (0x0–0xF).
The user initiates QSPI operation by loading a queue of commands in command RAM, writing transmit
data into transmit RAM, and then enabling the QSPI data transfer. The QSPI executes the queued
commands and sets the completion flag in the QSPI interrupt register (QIR[SPIF]) to signal their
completion. As another option, QIR[SPIFE] can be enabled to generate an interrupt.
The QSPI uses four queue pointers. The user can access three of them through fields in QSPI wrap register
(QWR):
The internal pointer is initialized to the same value as QWR[NEWQP]. During normal operation, the
following sequence repeats:
Execution continues at the internal pointer address unless the QWR[NEWQP] value is changed. After each
command is executed, QWR[ENDQP] and QWR[CPTQP] are compared. When a match occurs,
QIR[SPIF] is set and the QSPI stops unless wraparound mode is enabled. Setting QWR[WREN] enables
wraparound mode.
QWR[NEWQP] is cleared at reset. When the QSPI is enabled, execution begins at address 0x0 unless
another value has been written into QWR[NEWQP]. QWR[ENDQP] is cleared at reset but is changed to
show the last queue entry before the QSPI is enabled. QWR[NEWQP] and QWR[ENDQP] can be written
at any time. When the QWR[NEWQP] value changes, the internal pointer value also changes unless a
transfer is in progress, in which case the transfer completes normally. Leaving QWR[NEWQP] and
QWR[ENDQP] set to 0x0 causes a single transfer to occur when the QSPI is enabled.
Data is transferred relative to QSPI_CLK, which can be generated in any one of four combinations of
phase and polarity using QMR[CPHA,CPOL]. Data is transferred with the most significant bit (msb) first.
The number of bits transferred defaults to 8, but can be set to any value between 8 and 16 by writing a
value into the BITSE field of the command RAM (QCR[BITSE]).
22-10
•
•
•
•
•
1. The command pointed to by the internal pointer is executed.
2. The value in the internal pointer is copied into QWR[CPTQP].
3. The internal pointer is incremented.
32 receive data bytes (receive data RAM)
New queue pointer (QWR[NEWQP])—points to the first command in the queue
Internal queue pointer—points to the command currently being executed
Completed queue pointer (QWR[CPTQP])—points to the last command executed
End queue pointer (QWR[ENDQP]) —points to the final command in the queue
Throughout ColdFire documentation, the term word is used to designate a
16-bit data unit. The only exceptions to this appear in discussions of serial
communication modules such as QSPI that support variable-length data
units. To simplify these discussions, the functional unit is referred to as a
word regardless of length.
NOTE
Freescale Semiconductor
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