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 PIC18F2525?is a 28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology.?The following are the features:- ? 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/J2602 - 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 ? Programmable 16-Level High/Low-Voltage Detection (HLVD) module: - Supports interrupt on High/Low-Voltage Detection

The PIC16C711 is a low-cost, high-performance, CMOS, fully-static, 8-bit microcontrollers with integrated analog-to-digital (A/D) converters, in the PIC16C711 mid-range family. The separate instruction and data buses of the Harvard architecture allow a 14-bit wide instruction word with the separate 8-bit wide data. The two stage instruction pipeline allows all instructions to execute in a single cycle, except for program branches which require two cycles. A total of 35 instructions (reduced instruction set) are available. Additionally, a large register set gives some of the architectural innovations used to achieve a very high performance. PIC16C711 microcontrollers typically achieve a 2:1 code compression and a 4:1 speed improvement over other 8-bit microcontrollers in their class. The PIC16C711 devices have 36 bytes of RAM, the PIC16C711 has 68 bytes of RAM and the PIC16C715 has 128 bytes of RAM. Each device has 13 I/O pins. In addition a timer/counter is available. Also a 4-channel high-speed 8-bit A/D is provided.