Structure Diagram Analysis Based on Four Working Modes of Single Chip Timer/Counter

Mode 1

When M0=0 in TMOD and M1=0, it is a 13-bit counting or timing mode, in which TLi uses the lower 5 bits, and its structure is as shown in Fig. 4.2.

Figure 4.2 Structure diagram of T0 and T1 in mode 0

When M0=1 in TMOD and M1=0, it is 16-bit counting or timing mode, and its structure is shown in Figure 4.3.

Figure 4.3 Structure diagram of T0 and T1 in mode 1

Mode 3

When M0=0 in TMOD and M1=1, the 8-bit automatic reloading initial value counting or timing mode is shown in Figure 4.4.

Figure 4.4 Structure of T0 and T1 in Mode 2

In mode 2, the 16-bit counter is divided into two 8-bit counters, and THi is used to store the initial value. When the counter overflows, TFi is set to 1 on the one hand, and the application is interrupted; on the other hand, the value of THi is automatically loaded into TLi.

Mode 4

When T0 is mode 3, T1 is used as the baud rate generator. The TF1 and TR1 resources are loaned to T0, and T0 can form two independent structures. TL0 constitutes a complete 8-bit timer/counter, while TH0 It is a timer that can only divide the crystal frequency by 12, and its structure is shown in Figure 4.5. When T1 is used as the baud rate generator, it can be set to mode 0, 1 or 2 for any occasion where no interrupt control is required. Generally, when T1 is used as the baud rate generator, it is often set to the automatic reload mode of mode 2. The structure is shown in Figure 4.6.

Figure 4.5 Structure diagram of T0 in mode 3

Figure 4.6 When T0 is mode 3, T1 is the baud rate generator.

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