MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 223

• Manufacturer Part Number: MCF51EM256CLL
• Description: IC MCU 32BIT 256KB FLASH 100LQFP
• Manufacturer: Freescale Semiconductor
• Series: MCF51EMr

Specifications of MCF51EM256CLL

• Core Processor: Coldfire V1
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: I²C, SCI, SPI
• Peripherals: LCD, LVD, PWM, WDT
• Number Of I /o: 63
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 16x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Processor Series: MCF51EM
• Core: ColdFire V1
• Data Bus Width: 32 bit
• Data Ram Size: 16 KB
• Interface Type: RS-232, LIN
• Maximum Clock Frequency: 50 MHz
• Number Of Timers: 3
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: DEMOEM
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Chapter 9
Multiply-Accumulate Unit (MAC)
9.1
This chapter describes the functionality, microarchitecture, and performance of the multiply-accumulate
(MAC) unit in the ColdFire family of processors.
9.1.1
The MAC design provides a set of DSP operations that can improve the performance of embedded code
while supporting the integer multiply instructions of the baseline ColdFire architecture.
The MAC provides functionality in three related areas:
The MAC features a three-stage execution pipeline optimized for 16-bit operands, with a 16x16 multiply
array and a single 32-bit accumulator.
The three areas of functionality are addressed in detail in following sections. The logic required to support
this functionality is contained in a MAC module
9.1.1.1
The MAC is an extension of the basic multiplier in most microprocessors. It is typically implemented in
hardware within an architecture and supports rapid execution of signal processing algorithms in fewer
Freescale Semiconductor
1. Signed and unsigned integer multiplication
2. Multiply-accumulate operations supporting signed and unsigned integer operands as well as
3. Miscellaneous register operations
signed, fixed-point, and fractional operands
Introduction
Overview
Introduction to the MAC
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
Figure 9-1. Multiply-Accumulate Functionality Diagram
Operand Y
Accumulator(s)
Shift 0,1,-1
(Figure
+ / -
X
9-1).
Operand X
9-1