MCF5282CVM66 Freescale, MCF5282CVM66 Datasheet - Page 322
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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Fast Ethernet Controller (FEC)
17.4.5
The TDAR is a command register which the user writes to indicate the transmit descriptor ring is updated
(transmit buffers have been produced by the driver with the ready bit set in the buffer descriptor).
When the register is written, the TDAR bit is set. This value is independent of the data actually written by
the user. When set, the FEC polls the transmit descriptor ring and processes transmit frames (provided
ECR[ETHER_EN] is also set). After the FEC polls a transmit descriptor that is a ready bit not set, FEC
clears the TDAR bit and ceases transmit descriptor ring polling until the user sets the bit again, signifying
additional descriptors are placed into the transmit descriptor ring.
The TDAR register is cleared at reset, when ECR[ETHER_EN] is cleared, or when ECR[RESET] is set.
17.4.6
ECR is a read/write user register, though hardware may alter fields in this register as well. The ECR
enables/disables the FEC.
17-12
31–25
RDAR
31–25
TDAR
Field
23–0
Field
23–0
24
24
IPSBAR
Offset:
Reset 0 0 0 0 0 0 0
Reserved, must be cleared.
Set to 1 when this register is written, regardless of the value written. Cleared by the FEC device when no additional
empty descriptors remain in the receive ring. Also cleared when ECR[ETHER_EN] is cleared.
Reserved, must be cleared.
W
Reserved, must be cleared.
Set to 1 when this register is written, regardless of the value written. Cleared by the FEC device when no additional
ready descriptors remain in the transmit ring. Also cleared when ECR[ETHER_EN] is cleared.
Reserved, must be cleared.
R 0 0 0 0 0 0 0
Transmit Descriptor Active Register (TDAR)
Ethernet Control Register (ECR)
0x1014
31 30 29 28 27 26 25
Figure 17-5. Transmit Descriptor Active Register (TDAR)
TDAR
24
0
Table 17-7. RDAR Field Descriptions
Table 17-8. TDAR Field Descriptions
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Description
Description
8
7
Access: User read/write
6
Freescale Semiconductor
5
4
3
2
1
0
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