So for an example, we can say that if the TH0 – TL0 register pair is holding FFF0H, and it is in timer mode, then TF0 will be high after 10H = 16 machine cycles. When the register pair overflows from FFFFH to 0000H, then the TF0 of TCON register will be high, and it stops the timer/counter. In this case every event for counter operations or machine cycles for timer operation, the TH0– TL0 register-pair will be incremented by 1. In the following diagram, we are using Mode 1 for Timer0. The Mode 1 operation is the 16-bit timer or counter. At last set the TR1 of TCON register, and start the timer. Then the TH1 will be loaded with F0H, then enable the Timer1 interrupt. In the above program, the Timer1 is configured as timer mode 0. So for an example, we can say that if the TH1 is holding F0H, and it is in timer mode, then TF1will be high after 10H * 32 = 512 machine cycles. When the TH1overflows from FFH to 00H, then the TF1 of TCON register will be high, and it stops the timer/counter. In this example the Timer1is selected, in this case, every 32 (25)event for counter operations or 32 machine cycles for timer operation, the TH1 register will be incremented by 1. It uses 5 bits of TL0 or TL1 and all of the 8-bits of TH0 or TH1. The Mode 0 operation is the 8-bit timer or counter with a 5-bit pre-scaler. We can use this instruction: MOVTMOD, #0ADH So the bit patterns will be 1 0 1 0 1 1 0 1 = ADH To configure the system as hardware controlled mode, then the gate bits will be 1. The above instruction is executed, then the timer/counter will be controlled by the software. If we want to program the TMOD register with this bit pattern, we can use this instruction: MOVTMOD, #25H To configure the Timer0 as 16-bit event counter and Timer1 as 8-bit auto reload counter, we can use the bit pattern 0 0 1 0 0 1 0 1. The Gate bit will be high when the timer or counter is in mode 0 to 2. This is Mode 3 (The function depends on Timer0 or Timer1) This is Mode 3 (8-bit auto reload-timer/counter) (8-bit timer/counter, with 5-bit pre-scaler) Timer0 or Timer1 will be in RunMode when TRX bit of TCON register is high and INT0 or INT1 is high. Timer0 or Timer1 will be in RunMode when TRX bit of TCON register is high. In the following table, we will see the bit details and their different operations for high or low value. Now, let us see the circuit that controls the running of the timers. So only Timer0 is available for timer or counter operations. Timer1 is used for generating the baud rate. The Serial port is used for serial communication in mode 1 and 3. This register can be programmed to configure these timers or counters. Mode 3 has a different meaning for each timer register. The Mode 0 to Mode 2 are for both of the Timer/Counter. There are four different modes of the Timer or Counter. So for event counting the time duration is 2 µs. When the frequency is12MHz, then the maximum count frequency will be 12MHz/24 = 500KHz. So in this mode, at least two machine cycles are needed. The external input pins are sampled once in each machine cycle, and to determine the 1or 0 transitions, another machine cycle will be needed. This type of transitions is treated as events. In this mode, the timer register is incremented for each 1 to 0 transition of the external input pin. In the counter mode, the external events are counted. In this mode it ignores the external timer input pin. So when the clock frequency is 12MHz, then the timer register is incremented in each millisecond. So this register is incremented in each machine cycle. In the timer mode, the internal machine cycles are counted. The only difference between these two modes is the source for incrementing the timer registers. These modes areTimer mode and the Counter mode. The timer registers can be used in two modes. These registers are known as Timer0 andTimer1. For more information about Oracle (NYSE:ORCL), visit Intel 8051, there are two 16-bit timer registers. Oracle offers a comprehensive and fully integrated stack of cloud applications and platform services. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.
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