3
I/O PORTS AND SPECIAL FUNCTION REGISTERS
CHAPTER OBJECTIVES
In this chapter, the reader is introduced to some Special Function Registers (SFRs) and the overall architecture of the I/O ports of MCS-51. After completion of the chapter, the reader should be able to understand
- Names, locations (addresses), reset values and functions of all SFRs.
- Details of PSW, accumulator, B register, SP and I/O port registers.
- How to select any one of the four register banks of MCS-51.
- Bit addresses of different SFRs.
- Architecture and functioning of all four I/O ports of MCS-51.
- Difference between MCS-51 I/O ports and 8255 I/O ports.
3.1 | Introduction
In Chapter 2, it was mentioned that some of the internal memory locations (80H to FFH) of MCS-51 contain SFRs. ...
Get 8051 Microcontrollers, 2nd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
