AP-429 Application Techniques for the 83C152 Global Serial Channel in CSMA/CD Mode

The 83C152 is an 80C51BH based microcontroller with DMA capabilities and a high speed, multi-protocol, synchronous serial communication interface called the Global Serial Channel (GSC). The GSC uses packetized data frames that consist of a beginning of frame (BOF) flag, address byte(s), data byte(s), a Cyclic Redundancy Check (CRC), and an End Of Frame (EOF) flag. An example of this type of packet is shown in Figure 1. Most 80C152 users will be familiar with UARTs, another type of serial interface. Figures 1 and 2 compare the two types of frames. The UART uses start and stop bits with a data byte between as shown in Figure 2. The 83C152 retains the standard MCS(tm)-51 UART.

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