"Single-chip microcomputer principles and control technology Chapter 2022 Excellent Document. ppt; Single-chip microcomputer principles and control technology Chapter 2022 Excellent Document. ppt; Chapter 8 80C51 Serial Expansion Technology The key points of this chapter are serial expansion characteristics, classification of serial expansion methods, the concept of virtual serial expansion, shift register serial expansion methods, 80C51 I/O virtual serial interface, I2C bus serial expansion technology, I2C bus expansion I/O port, general device PCF8574 virtual I2C bus expansion, AT24CXX series E2PROM §8-1 Serial Expansion Overview, 1. Serial expansion characteristics: (1) Maximize the resources and functions of the minimum system. The resources originally occupied by parallel expansion of the P0 port and P2 port are directly used for the I/O port. (2) Simplify the connection lines and reduce the board area. (3) Good scalability, which can simplify the design of the system. (4) Disadvantages of serial expansion: small data throughput capacity, slow signal transmission speed, but as the working frequency of the CPU chip increases, and the enhancement of the functions of the serial expansion chip, these disadvantages will gradually fade. 1. Single-line system The typical representative of the single-line system is the single bus (1-wire) introduced by Dallas company. 2. Two-line system The typical representative of the two-line system is the I2C bus (Intel Integrated Circuit BUS) introduced by Philips. MOV MTD,"
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