标题: PIC18F4450 Data Sheet [打印本页] 作者: enroo_ma 时间: 2009-8-20 10:15 标题: PIC18F4450 Data Sheet PIC18F2450/4450 Data Sheet (3/19/2008)
Universal Serial Bus Features:
ï USB V2.0 Compliant
ï Low Speed (1.5 Mb/s) and Full Speed (12 Mb/s)
ï Supports Control, Interrupt, Isochronous and
Bulk Transfers
ï Supports Up to 32 Endpoints (16 bidirectional)
ï 256-Byte Dual Access RAM for USB
ï On-Chip USB Transceiver with On-Chip Voltage
Regulator
ï Interface for Off-Chip USB Transceiver
Power-Managed Modes:
ï Run: CPU on, Peripherals on
ï Idle: CPU off, Peripherals on
ï Sleep: CPU off, Peripherals off
ï Idle mode Currents Down to 5.8 μA Typical
ï Sleep mode Currents Down to 0.1 μA Typical
ï Timer1 Oscillator: 1.8 μA Typical, 32 kHz, 2V
ï Watchdog Timer: 2.1 μA Typical
ï Two-Speed Oscillator Start-up
Flexible Oscillator Structure:
ï Four Crystal modes, including High-Precision PLL
for USB
ï Two External Clock modes, up to 48 MHz
ï Internal 31 kHz Oscillator
ï Secondary Oscillator using Timer1 @ 32 kHz
ï Dual Oscillator Options allow Microcontroller and
USB module to Run at Different Clock Speeds
ï Fail-Safe Clock Monitor:
- Allows for safe shutdown if any clock stops
Peripheral Highlights:
ï High-Current Sink/Source: 25 mA/25 mA
ï Three External Interrupts
ï Three Timer modules (Timer0 to Timer2)
ï Capture/Compare/PWM (CCP) module:
- Capture is 16-bit, max. resolution 5.2 ns
- Compare is 16-bit, max. resolution 83.3 ns
- PWM output: PWM resolution is 1 to 10-bit
ï Enhanced USART module:
- LIN bus support
ï 10-Bit, Up to 13-Channel Analog-to-Digital Converter
module (A/D):
- Up to 100 ksps sampling rate
- Programmable acquisition time
Special Microcontroller Features:
ï C Compiler Optimized Architecture with Optional
Extended Instruction Set
ï Flash Memory Retention: > 40 Years
ï Self-Programmable under Software Control
ï Priority Levels for Interrupts
ï 8 x 8 Single-Cycle Hardware Multiplier
ï Extended Watchdog Timer (WDT):
- Programmable period from 4 ms to 131s
ï Programmable Code Protection
ï Single-Supply In-Circuit Serial Programmingô
(ICSPô) via Two Pins
ï In-Circuit Debug (ICD) via Two Pins
ï Optional Dedicated ICD/ICSP Port
(44-pin TQFP devices only)
ï Wide Operating Voltage Range (2.0V to 5.5V)
