El micro a usar será el
18F4520.
El costo es el mismo (al menos en Argentina) que el de un 16f877A, pero es MUCHO mas potente:
28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt TechnologyPower-Managed Modes:• Run: CPU on, Peripherals on
• Idle: CPU off, Peripherals on
• Sleep: CPU off, Peripherals off
• Idle mode Currents Down to 5.8 μA Typical
• Sleep mode Current Down to 0.1 μA Typical
• Timer1 Oscillator: 1.8 μA, 32 kHz, 2V
• Watchdog Timer: 2.1 μA
• Two-Speed Oscillator Start-up
Peripheral Highlights:• High-Current Sink/Source 25 mA/25 mA
• Three Programmable External Interrupts
• Four Input Change Interrupts
• Up to 2 Capture/Compare/PWM (CCP) modules,
one with Auto-Shutdown (28-pin devices)
• Enhanced Capture/Compare/PWM (ECCP)
module (40/44-pin devices only):
- One, two or four PWM outputs
- Selectable polarity
- Programmable dead time
- Auto-shutdown and auto-restart
• Master Synchronous Serial Port (MSSP) module
supporting 3-Wire SPI (all 4 modes) and I2C™
Master and Slave modes
• Enhanced Addressable USART module:
- Supports RS-485, RS-232 and LIN 1.2
- RS-232 operation using internal oscillator
block (no external crystal required)
- Auto-wake-up on Start bit
- Auto-Baud Detect
• 10-Bit, up to 13-Channel Analog-to-Digital (A/D)
Converter module:- Auto-acquisition capability
- Conversion available during Sleep
• Dual Analog Comparators with Input Multiplexing
Flexible Oscillator Structure:Four Crystal modes,
up to 40 MHz4x Phase Lock Loop (available for
internal oscillators)
Two External RC modes, up to 4 MHz
Two External Clock modes, up to
Internal Oscillator Block:
- 8 user-selectable frequencies, from
8MHz
- Provides a complete range of clock
from 31 kHz to 32 MHz when used
- User-tunable to compensate for frequency
Secondary Oscillator using Timer1
Fail-Safe Clock Monitor:
- Allows for safe shutdown if peripheral
Special Microcontroller Features:
C Compiler Optimized Architecture:
- Optional extended instruction set
optimize re-entrant code
100,000 Erase/Write Cycle Enhanced
Program Memory Typical
1,000,000 Erase/Write Cycle Data
Memory Typical
Flash/Data EEPROM Retention: 100
Self-Programmable under Software
Priority Levels for Interrupts
8 x 8 Single-Cycle Hardware Multiplier
Extended Watchdog Timer (WDT):
- Programmable period from 4 ms
Single-Supply 5V In-Circuit Serial
Programming™ (ICSP™) via Two
In-Circuit Debug (ICD) via Two Pins
Wide Operating Voltage Range: 2.0V
Programmable 16-Level High/Low-
Detection (HLVD) module:
- Supports interrupt on High/Low-
Detection
Programmable Brown-out Reset (BOR)
- With software enable option