PIC18F2550 Microcontroller

The PIC17C44 is a High-Performance 8-Bit CMOS EPROM/ROM Microcontroller . The following are the features:- • 33 I/O pins with individual direction control • High current sink/source for direct LED drive - RA2 and RA3 are open drain, high voltage (12V), high current (60 mA), I/O • Two capture inputs and two PWM outputs - Captures are 16-bit, max resolution 160 ns - PWM resolution is 1- to 10-bit • TMR0: 16-bit timer/counter with 8-bit programmable prescaler • TMR1: 8-bit timer/counter

The PIC16F873, PIC16F874, PIC16F876 and PIC16F877 are the four covered devices. Devices for the PIC16F876/873 and PIC16F877/874 available in 28-pin and 40-pin packages, respectively. On 28-pin devices, the Parallel Slave Port is not implemented. Each PIC16F87X device has the ability to access an 8K word block of program memory continuously. Only 11 bits of address are provided by the CALL and GOTO instructions, allowing branching inside any 2K program memory page. PCLATH4:3> provides the upper 2 bits of the address when performing a CALL or GOTO instruction. The user must make sure that the page choose bits are set when performing a CALL or GOTO instruction in order for the chosen programme memory page to be addressed. The full 13-bit PC is popped off the stack whenever a return from a CALL instruction (or interrupt) is performed. Therefore, the return instructions do not need the modification of the PCLATH4:3> bits (which POPs the address from the stack). Data Memory Organization The General Purpose Registers and Special Function Registers are divided up into several banks in the data memory. The bank select bits are bits RP1 (Status:6) and RP0 (Status:5). Each bank stretches to 7Fh (128 bytes). The Special Function Registers are only permitted in the bottom positions of each bank. General Purpose Registers, which are implemented as static RAM, are located above the Special Function Registers. Special Function Registers are present in all installed banks. For code reduction and faster access, some commonly used Special Function Registers from one bank may be duplicated in another bank.  

The PIC18F452 is a 28/40-pin High Performance, Enhanced FLASH Microcontrollers with 10-Bit A/D. The following are the features:- • High current sink/source 25 mA/25 mA • Three external interrupt pins • Timer0 module: 8-bit/16-bit timer/counter with 8-bit programmable prescaler • Timer1 module: 16-bit timer/counter • Timer2 module: 8-bit timer/counter with 8-bit period register (time base for PWM) • Timer3 module: 16-bit timer/counter • Secondary oscillator clock option – Timer1/Timer3