2.1 ARCHITECTURE OF A MICROCONTROLLER

2.1.1 Functional Overview of 8048 and 8049 Microcontroller Architecture

The 8048 and 8049 microcontrollers are predecessors to 8051. Figure 2.1 shows a functional overview with the help of a block diagram of an exemplary 8048 microcomputer (microcontroller). Additional details of the basic processing unit are given in Section 2.3.1. Figure 2.2 shows the pin signals in an 8048 series microcomputer. Table 2.1 lists the pin signals. [Bar over a signal means that the signal activates when it is 0. For example, activates read when made 0 by the processor.]

Figure 2.1. Functional Overview (Block Diagram) of an Exemplary 8048 Microcomputer (Microcontroller)