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ADMCF327

28-Lead Flash Memory DSP Switched Reluctance Motor Controller

Analog Devices 

ADMCF327

GENERAL DESCRIPTION

The ADMCF327 is a low cost, single-chip DSP-based controller,

suitable for permanent magnet synchronous motors, ac induction

motors, and brushless dc motors. The ADMCF327 integrates a

20 MIPS, fixed-point DSP core with a complete set of motor

control and system peripherals that permits fast, efficient devel-

opment of motor controllers.

The DSP core of the ADMCF327 is the ADSP-2171, which is

completely code-compatible with the ADSP-21xx DSP family

and combines three computational units, data address generators

and a program sequencer. The computational units comprise an

ALU, a multiplier/accumulator (MAC) and a barrel shifter.

The ADSP-2171 adds new instructions for bit manipulation,

multiplication (× squared), biased rounding and global inter-

rupt masking.

The system peripherals are the power-on reset circuit (POR),

the watchdog timer and a synchronous serial port. The serial

port is configurable, and double buffered, with hardware sup-

port for UART and SCI port emulation.

The ADMCF327 provides 512 × 24-bit program memory RAM,

4K × 24-bit program memory ROM, 4K × 24-bit program

FLASH memory, and 512 × 16-bit data memory RAM. The

user code will be stored and executed from the flash memory.

The program and data memory RAM can be used for dynamic

data storage or can be loaded through the serial port from an

external device as in other ADMCxxx family parts. The program

memory ROM contains a monitor function as well as useful rou-

tines for erasing, programming, and verifying the flash memory.

The motor control peripherals of the ADMCF327 provide a 12-bit

analog data acquisition system with six analog input channels,

and an internal voltage reference. In addition, a three-phase,

16-bit, center-based PWM generation unit can be used to produce

high accuracy PWM signals with minimal processor overhead.

The ADMCF327 also contains two auxiliary PWM outputs

and nine lines of digital I/O.

Because the ADMCF327 has a limited number of pins, functions

such as the auxiliary PWM and the serial communication port

are multiplexed with the nine programmable input/output (PIO)

pins. The pin functions can be independently selected to allow

maximum flexibility for different applications.

DATA

ADDRESS

GENERATOR

#1

DATA

ADDRESS

GENERATOR

#2

INSTRUCTION

REGISTER

PROGRAM

SEQUENCER

14

14

24

BUS

EXCHANGE

16

PM ROM

4K ؋ 24

PM RAM

512 ؋ 24

FLASH

PROGRAM

MEMORY

4K ؋ 24

PMA BUS

DMA BUS

PMD BUS

DMD BUS

DM RAM

512 ؋ 16

INPUT REGS

ALU

OUTPUT REGS

INPUT REGS

MAC

OUTPUT REGS

16

R BUS

INPUT REGS

SHIFTER

OUTPUT REGS

CONTROL

LOGIC

COMPANDING

CIRCUITRY

Figure 3. DSP Core Block Diagram

TIMER

TRANSMIT REG

RECEIVE REG

SERIAL

PORT

6

REV. 0

–7–

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