Microchip Technology dsPIC33F Family Bedienungsanleitung PDF herunterladen (Seite 25)

dsPIC33F

8.0 dsPIC33F PERIPHERALS

The Digital Signal Controller (DSC) family of 16-bit

DSC devices provides the integrated functionality of

many peripherals. Specific peripheral functions

include:

• Analog-to-Digital Converters

- 10-bit High-Speed A/D Converter

- 12-bit High-Resolution A/D Converter

• General Purpose 16-Bit Timers

• Motor Control PWM module

• Quadrature Encoder Interface module

• Input Capture module

• Output Compare/PWM module

• Data Converter Interface

• Serial Peripheral Interface (SPI™) module

•UART module

•I

C™ module

• Controller Area Network (CAN) module

• I/O pins

8.1 Analog-to-Digital Converters

The Analog-to-Digital (A/D) Converters provide up to

32 analog inputs with both single-ended and differential

inputs. These modules offer on-board sample and hold

circuitry.

To minimize control loop errors due to finite update

times (conversion plus computations), a high-speed

low-latency ADC is required.

In addition, several hardware features have been

included in the peripheral interface to improve real-time

performance in a typical DSP-based application.

• Result alignment options

• Automated sampling

• Automated channel scanning

• Dual port data buffer

• External conversion start control

The A/D Converter is available in either of the following

configurations:

• 10-bit, 1.1 Msps A/D module:

- 2.2 Msps A/D conversion using 2 channels

• 12-bit, 500 ksps A/D module:

- 1 Msps A/D conversion using 2 channels

Key features of the A/D module include:

• 10-bit or 12-bit resolution

• Unipolar differential sample/hold amplifiers

• Up to 32 input channels

• Selectable voltage reference sources

-External V

REF+ and VREF- pins available

• ±1 LSB max Differential Nonlinearity (DNL)

(3.3V ±10%)

• ±1 LSB max Integral Nonlinearity (INL)

(3.3V ±10%)

• Up to 4 on-chip sample and hold amplifiers in

each A/D

- Enables simultaneous sampling of 2, 4 or

8 analog inputs

• Automated channel scanning

• Single-supply operation: 3.0-3.6V

• 2.2 Msps or 1 Msps sampling rate at 3.0V

• Ability to convert during CPU Sleep and Idle

modes

• Conversion start can be manual or synchronized

with 1 of 4 trigger sources (automatic, Timer3,

external interrupt, PWM period match)

• A/D can use DMA for buffer storage

• Lower and upper half of buffer can be filled on

alternate conversions

8.2 General Purpose Timer Modules

The General Purpose (GP) timer modules provide the

time base elements for input capture and output

compare/PWM. They can be configured for Real-Time

Clock operation as well as various timer/counter

modes. The timer modes count pulses of the internal

time base, whereas counter modes count external

pulses that appear on the timer clock pin.

The dsPIC33F device supports up to nine 16-bit timers

(Timer1 through Timer9). Eight of the 16-bit timers can

be configured as four 32-bit timers (Timer2/3, Timer4/5,

Timer6/7 and Timer8/9). Each timer has several

selectable operating modes.

8.2.1 TIMER1

The Timer1 module (Figure 8-1) is a 16-bit timer that can

serve as the time counter for an asynchronous Real-

Time Clock, or operate as a free-running interval timer/

counter. The 16-bit timer has the following modes:

•16-Bit Timer

• 16-Bit Synchronous Counter

• 16-Bit Asynchronous Counter

Further, the following operational characteristics are

supported:

• Timer gated by external pulse

• Selectable prescaler settings

• Timer operation during CPU Idle and Sleep modes

• Interrupt on 16-Bit Period register match or falling

edge of external gate signal

Timer1, when operating in Real-Time Clock (RTC)

mode, provides time of day and event time-stamping

capabilities. Key operational features of the RTC are:

• Operation from 32 kHz LP oscillator

• 8-bit prescaler

•Low power

• Real-Time Clock interrupts

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