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Chapter 2

Chapter 2. Device Overview. PIC 18F4520. The advantages of all PIC18Fxxxx microcontrollers: High computational performance High-endurance Enhanced Flash program memory. PIC18F4520 Diagram. Power Management Features. Run: CPU on, Peripherals on Idle: CPU off, Peripherals on

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Chapter 2

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  1. Chapter 2 Device Overview

  2. PIC 18F4520 • The advantages of all PIC18Fxxxx microcontrollers: • High computational performance • High-endurance • Enhanced Flash program memory

  3. PIC18F4520 Diagram

  4. Power Management Features • Run: CPU on, Peripherals on • Idle: CPU off, Peripherals on • Sleep: CPU off, Peripherals off • Run mode 11 μA Typical • Idle mode 2.5 μA Typical • Sleep mode 100 nA Typical • Ultra Low 50nA Input Leakage • Two-Speed Oscillator Start-up

  5. Flexible Oscillator Structure • Four Crystal modes, up to 40 MHz • 4x Phase Lock Loop (PLL) – Available for Crystal and Internal Oscillators • Two External RC modes, up to 4 MHz • Two External Clock modes, up to 40 MHz • Internal Oscillator Block: • Fast wake from Sleep and Idle, 1 μs typical • Secondary Oscillator using Timer1 @ 32 kHz • Fail-Safe Clock Monitor: • Allows for safe shutdown if peripheral clock stops

  6. Peripheral Highlights • High-Current Sink/Source 25 mA/25 Ma • Three Programmable External Interrupts • Four Input Change Interrupts • Enhanced Capture/Compare/PWM (ECCP) module • One, two or four PWM outputs • Selectable polarity • Programmable dead time • Auto-shutdown and auto-restart

  7. Peripheral Highlights • Enhanced Addressable USART module: • Supports RS-485, RS-232 and LIN/J2602 • 10-Bit, up to 13-Channel Analog-to-Digital Converter module: • Auto-acquisition capability • Dual Analog Comparators with Input Multiplexing

  8. NanoWatt TECHNOLOGY • Alternate Run Modes • Multiple Idle Modes • On-the-Fly Mode Switching • Low Consumption in Key Modules

  9. Alternate Run Modes • By clocking the controller from the Timer1 source or the internal oscillator block, power consumption during code execution can be reduced by 90%.

  10. Multiple Idle Modes • CPU core disabled but the peripherals still active. • Power consumption can be reduced even further, to as little as 4% of normal operation requirements.

  11. On-the-Fly Mode Switching • The power managed modes are invoked by user code during operation • Allowing the user to incorporate power-saving ideas into their application’s software design

  12. Low Consumption in Key Modules • The power requirements for both Timer1 and the Watchdog Timer are minimized

  13. Other Special Features • Memory Endurance • Self-Programmability • Extended Instruction Set • Enhanced CCP Module • Enhanced Addressable USART • 10-Bit A/D Converter • Extended Watchdog Timer (WDT)

  14. Memory Endurance • The Enhanced Flash cells are rated to last for many thousands of erase/write cycles. • Data retention without refresh is conservatively estimated to be greater than 40 years.

  15. Self-Programmability • These devices can write to their own program memory spaces under internal software control. • possible to create an application that can update itself in the field.

  16. Extended Instruction Set • Introduces an optional extension to the PIC18 instruction set: • which adds 8 new instructions and • an Indexed Addressing mode. • Enabled as a device configuration option: • designed to optimize re-entrant application code originally developed in high-level languages.

  17. Enhanced CCP Module • In PWM mode, this module provides: • 1, 2 or 4 modulated outputs for controlling • half-bridge and full-bridge drivers. • Auto-shutdown: • for disabling PWM outputs on interrupt, or other select conditions, and • auto-restart to reactivate outputs once the condition has cleared.

  18. Enhanced Addressable USART • Standard RS-232 operation • Provides support for the LIN bus protocol. • Automatic baud rate detection • A 16-bit Baud Rate Generator for improved resolution. • Provides stable operation that talk to the outside world.

  19. 10-Bit A/D Converter • This module incorporates programmable acquisition time. • Allowing for a channel to be selected • A conversion to be initiated without waiting for a sampling period • Reducing code overhead.

  20. Extended Watchdog Timer (WDT) • Incorporates a 16-bit prescaler • allowing an extended time-out range • stable across operating voltage and temperature.

  21. Device Features

  22. Block Diagram

  23. X X X X X X X X OSC1/CLK1 / RA7 AN0 RA4 / TOCK / C1OUT RA5 / AN5/SS/ OSC2 / CLK0/ RA6 RA0 / AN0 RA3 / AN3 / Vref + RA1 / AN1 RA2 / AN2 /Vref - / cvREF PORTA PORTA is a bidirectional I/O port PIC

  24. X X X X X X X X RB7C/CKB3 / PGO RB4 / KB0 / AN11 RB5 / KB1/ PGM RB6 / KB2 / PGC RB0 / NT0/FLTO/AN12 RB3 / AN9 / CCP2 RB1 / INT1/AN10 RB2 / INT2 / AN8 PORTB PORTB is a bidirectional I/O port PIC

  25. X X X X X X X X RC7 /RX /DT RC4 / SO1 /SDA RC5 / SD0 RC6 /TX /CK RC0 /T1OS0 /T13CK1 RC3 /SCK/SCL RC1 / T1OS /CCP2 RC2 / CCP1 /P1A PORTC PORTC is a bidirectional I/O port PIC

  26. RD5 / PSP5 /P1B RD0 /PSP0;RD4 / PSP4 RD7 / PSP7 / P1D RD6 / PSP6/ P1C X X X X PORTD PORTD is a bidirectional I/O port or a Parallel Slave port PIC

  27. X X X X RE1 /WR / AN6 RE0 /RD / AN5 MCLR / Vpp / RE3 RE2 / CS / AN7 PORTE PORTE is a bidirectional I/O port PIC

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