Part Number : PIC16F648A
Function : 18-pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
Package : DIP, SOIC 18 Pin, SSOP 20 Pin Type
Maker : Microchip Technology
Pinouts : 
Description :
The PIC16F627A / PIC16F628A / PIC16F648A are 18-pin Flash-based members of the versatile PIC16F627A / PIC16F628A / PIC16F648A family of low-cost, high-performance, CMOS, fully static, 8-bit microcontrollers.
All PIC microcontrollers employ an advanced RISC architecture. The IC16F627A/628A/648A have enhanced core features, an eight-level deep stack, and multiple internal and external interrupt sources. 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, complemented by a large register set.
Features :
1. Operating speeds from DC – 20 MHz
2. Interrupt capability
3. 8-level deep hardware stack
4. Direct, Indirect and Relative Addressing modes
Datasheet PDF Download : 
Others datasheet of same file :
16F628A-I/ML, PIC16F627A, PIC16F627A-I/P, PIC16F628A, PIC16F628A-E/SO