Àû²©¡¤(¼¯ÍÅ)ÓÐÏÞ¹«Ë¾¹ÙÍø

GENERAL DESCRIPTION

The PIC12F508/509/16F505 devices from Microchip Technology are low-cost, high-performance, 8-bit, fully-static, Flash-based CMOS microcontrollers. They employ a RISC architecture with only 33 single-word/ single-cycle instructions. All instructions are single cycle (200 ¦Ìs) except for program branches, which take two cycles. The PIC12F508/509/16F505 devices deliver performance an order of magnitude higher than their competitors in the same price category. The 12-bit wide instructions are highly symmetrical, resulting in a typical 2:1 code compression over other 8-bit microcontrollers in its class. The easy to use and easy to remember instruction set reduces development time significantly.

High-Performance RISC CPU:

? Only 33 Single-Word Instructions to Learn

? All Single-Cycle Instructions Except for Program

Branches, which are Two-Cycle

? 12-Bit Wide Instructions

? 2-Level Deep Hardware Stack

? Direct, Indirect and Relative Addressing modes

for Data and Instructions

? 8-Bit Wide Data Path

? 8 Special Function Hardware Registers

? Operating Speed:

- DC ¨C 20 MHz clock input (PIC16F505 only)

- DC ¨C 200 ns instruction cycle (PIC16F505

only)

- DC ¨C 4 MHz clock input

- DC ¨C 1000 ns instruction cycle

Special Microcontroller Features:

? 4 MHz Precision Internal Oscillator:

- Factory calibrated to ¡À1

? In-Circuit Serial Programming? (ICSP?)

? In-Circuit Debugging (ICD) Support

? Power-On Reset (POR)

? Device Reset Timer (DRT)

? Watchdog Timer (WDT) with Dedicated On-Chip

RC Oscillator for Reliable Operation

? Programmable Code Protection

? Multiplexed MCLR Input Pin

? Internal Weak Pull-Ups on I/O Pins

? Power-Saving Sleep mode

? Wake-Wp from Sleep on Pin Change

? Selectable Oscillator Options:

- INTRC: 4 MHz precision Internal oscillator

- EXTRC: External low-cost RC oscillator

- XT: Standard crystal/resonator

- HS: High-speed crystal/resonator

(PIC16F505 only)

- LP: Power-saving, low-frequency crystal

- EC: High-speed external clock input

(PIC16F505 only) (Continue ...)