DSPIC33FJ128GP706-E/PT Microchip Technology, DSPIC33FJ128GP706-E/PT Datasheet - Page 28

• Manufacturer Part Number: DSPIC33FJ128GP706-E/PT
• Description: IC DSPIC MCU/DSP 128K 64TQFP
• Manufacturer: Microchip Technology
• Series: dsPIC™ 33Fr

Specifications of DSPIC33FJ128GP706-E/PT

• Core Processor: dsPIC
• Core Size: 16-Bit
• Speed: 40 MIPs
• Connectivity: CAN, I²C, IrDA, LIN, SPI, UART/USART
• Peripherals: AC'97, Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 18x10b/12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 64-TFQFP
• For Use With: DM300024 - KIT DEMO DSPICDEM 1.1DV164033 - KIT START EXPLORER 16 MPLAB ICD2MA330012 - MODULE DSPIC33 100P TO 84QFPMA330011 - MODULE DSPIC33 100P TO 100QFPDM300019 - BOARD DEMO DSPICDEM 80L STARTERDM240001 - BOARD DEMO PIC24/DSPIC33/PIC32AC164327 - MODULE SKT FOR 64TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

MCP3909 / dsPIC33F 3-Phase Energy Meter Reference Design
DS51723A-page 28
After system power-up, the MCU enters the initialization process, which includes
proper configuration of the I/O ports and on-chip peripherals (such as timer, UART, SPI
and IC). At the same time, the system control parameters can be loaded from the
external EEPROM and variables are all initialized.
Since most tasks of this system are accomplished through interrupts, only three tasks
are carried out in the system main loop, which are interpreting/processing UART
communication protocol, calculating parameters, and detecting neutral current. The
UART communication is performed in function UART_process(), the executing
frequency of which depends on the polling frequency of the upper computer.
Parameters are calculated by the function Calculation(), which is executed once every
3 cycles of the power grid. Neutral current is detected by function ComputeNeutral-
Current(), and computing is performed once every 16 cycles of the power grid.
© 2009 Microchip Technology Inc.