DSP56F807 Motorola Inc, DSP56F807 Datasheet - Page 4

• Manufacturer Part Number: DSP56F807
• Description: 56F807 16-bit Hybrid Processor
• Manufacturer: Motorola Inc

A total of 2K words of Boot Flash is incorporated for easy customer-inclusion of field-programmable
software routines that can be used to program the main Program and Data Flash memory areas. Both
Program and Data Flash memories can be independently bulk erased or erased in page sizes of 256 words.
The Boot Flash memory can also be either bulk or page erased.
A key application-specific feature of the 56F807 is the inclusion of two Pulse Width Modulator (PWM)
modules. These modules each incorporate three complementary, individually programmable PWM signal
outputs (each module is also capable of supporting six independent PWM functions, for a total of 12 PWM
outputs) to enhance motor control functionality. Complementary operation permits programmable dead
time insertion, distortion correction via current sensing by software, and separate top and bottom output
polarity control. The up-counter value is programmable to support a continuously variable PWM frequency.
Edge- and center-aligned synchronous pulse width control (0% to 100% modulation) is supported. The
device is capable of controlling most motor types: ACIM (AC Induction Motors), both BDC and BLDC
(Brush and Brushless DC motors), SRM and VRM (Switched and Variable Reluctance Motors), and stepper
motors. The PWMs incorporate fault protection and cycle-by-cycle current limiting with sufficient output
drive capability to directly drive standard optoisolators. A “smoke-inhibit”, write-once protection feature
for key parameters is also included. A patented PWM waveform distortion correction circuit is also
provided. Each PWM is double-buffered and includes interrupt controls to permit integral reload rates to be
programmable from 1 to 16. The PWM modules provide a reference output to synchronize the
analog-to-digital converters.
The 56F807 incorporates two separate Quadrature Decoders capable of capturing all four transitions on the
two-phase inputs, permitting generation of a number proportional to actual position. Speed computation
capabilities accommodate both fast- and slow-moving shafts. An integrated watchdog timer in the
Quadrature Decoder can be programmed with a time-out value to alarm when no shaft motion is detected.
Each input is filtered to ensure only true transitions are recorded.
This controller also provides a full set of standard programmable peripherals that include two Serial
Communications Interfaces (SCI), one Serial Peripheral Interface (SPI), and four Quad Timers. Any of
these interfaces can be used as General-Purpose Input/Outputs (GPIO) if that function is not required. A
Controller Area Network interface (CAN Version 2.0 A/B-compliant), an internal interrupt controller, and
14 dedicated GPIO lines are also included on the 56F807.
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56F807 Technical Data