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STC12LE5616AD Datasheet(PDF) 165 Page - STCmicro Technology Co,.Ltd |
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STC12LE5616AD Datasheet(HTML) 165 Page - STCmicro Technology Co,.Ltd |
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165 / 377 page  Chapter 7. Timer/Counter 0/1 Timer 0 and timer 1 are like the ones in the conventional 8051, both of them can be individually configured as timers or event counters. In the “Timer” function, the register is incremented every 12 system clocks or every system clock depending on AUXR.7(T0x12) bit and AUXR.6(T1x12). In the default state, it is fully the same as the conventional 8051. In the x12 mode, the count rate equals to the system clock. In the “Counter” function, the register is incremented in response to a 1-to-0 transition at its corresponding external input pin, T0 or T1. In this function, the external input is sampled once at the positive edge of every clock cycle. When the samples show a high in one cycle and a low in the next cycle, the count is incremented. The new count value appears in the register during at the end of the cycle following the one in which the transition was detected. Since it takes 2 machine cycles (24 system clocks) to recognize a l-to-0 transition, the maximum count rate is 1/24 of the system clock. There are no restrictions on the duty cycle of the external input signal, but to ensure that a given level is sampled at least once before it changes, it should be held for at least one full machine cycle. In addition to the “Timer” or “Counter” selection, Timer 0 and Timer 1 have four operating modes from which to select. The “Timer” or “Counter” function is selected by control bits C/T in the Special Function Register TMOD. These two Timer/Counter have four operating modes, which are selected by bit-pairs (M1, M0) in TMOD. Modes 0, 1, and 2 are the same for both Timer/Counters. Mode 3 is different.The four operating modes are described in the following text. Symbol Description Address Bit Address and Symbol MSB LSB Value after Power-on or Reset TCON Timer Control 88H TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 0000 0000B TMOD Timer Mode 89H GATE C/T M1 M0 GATE C/T M1 M0 0000 0000B TL0 Timer Low 0 8AH 0000 0000B TL1 Timer Low 1 8BH 0000 0000B TH0 Timer High 0 8CH 0000 0000B TH1 Timer High 1 8DH 0000 0000B AUXR Auxiliary register 8EH T0x12 T1x12 UART_M0x6 EADCI ESPI ELVDI - - 0000 00xxB WAKE_CLKO CLK_Output Power down Wake-up control register 8FH PCAWAKEUP RXD_PIN_IE T1_PIN_IE T0_PIN_IE - - T1CLKO T0CLKO 0000 xx00B 7.1 Special Function Registers about Timer/Counter 165 |
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