MCF5282CVM66 Freescale, MCF5282CVM66 Datasheet - Page 87

• Manufacturer Part Number: MCF5282CVM66
• Manufacturer: Freescale

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

Figure 3-7
40-bit product used for accumulation, and 48-bit accumulator formats.
Therefore, the 48-bit accumulator definition is a function of the EMAC operating mode. Given that each
48-bit accumulator is the concatenation of 16-bit accumulator extension register (ACCextn) contents and
32-bit ACCn contents, the specific definitions are:
if MACSR[6:5] == 00
if MACSR[6:5] == 01 or 11 /* signed fractional mode */
if MACSR[6:5] == 10
The four accumulators are represented as an array, ACCn, where n selects the register.
Freescale Semiconductor
Complete Accumulator[47:0] = {ACCextn[15:0], ACCn[31:0]}
Complete Accumulator [47:0] = {ACCextn[15:8], ACCn[31:0], ACCextn[7:0]}
Complete Accumulator[47:0] = {ACCextn[15:0], ACCn[31:0]}
and
Extended Product
Extended Product
Figure 3-8
Accumulator
Accumulator
Product
Product
+
+
show relative alignment of input operands, the full 64-bit product, the resulting
Figure 3-8. Signed and Unsigned Integer Alignment
Extension Byte Upper [7:0]
Extension Byte Upper [7:0]
/* signed integer mode */
/* unsigned integer mode */
40
X
24
X
Figure 3-7. Fractional Alignment
OperandY
OperandX
OperandY
OperandX
8
8
8
8
Extension Byte Lower [7:0]
40
40
8
8
8
Accumulator [31:0]
32
32
32
32
32
32
32
23
Accumulator [31:0]
Enhanced Multiply-Accumulate Unit (EMAC)
Extension Byte Lower [7:0]
8
0
3-9