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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AD83C154-12 데이터시트(PDF) 8 Page - TEMIC Semiconductors |
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AD83C154-12 데이터시트(HTML) 8 Page - TEMIC Semiconductors |
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8 / 24 page  80C154/83C154 Rev.F (14 Jan. 97) 8 MATRA MHS Figure 6. External Drive Configuration. Hardware Description Same as for the 80C51, plus a third timer/counter : Timer/Event Counter 2 Timer 2 is a 16 bit timer/counter like Timers 0 and 1, it can operate either as a timer or as an event counter. This is selected by bit C/T2 in the Special Function Register T2CON (Figure 1). It has three operating modes : “capture”, “autoload” and “baud rate generator”, which are selected by bits in T2CON as shown in Table 2. Table 2.Timer 2 Operating Modes. RCLK + TCLK CP/RL2 TR2 MODE 0 0 1 X 0 1 X X 1 1 1 0 16 bit auto-reload 16 bit capture baud rate generator (off) In the capture mode there are two options which are selected by bit EXEN2 in T2CON; If EXEN2 = 0, then Timer 2 is a 16 bit timer or counter which upon overflowing sets bit TF2, the Timer 2 overflow bit, which can be used to generate an interrupt. If EXEN2 = 1, then Timer 2 still does the above, but with the added feature that a 1-to-0 transition at external input T2EX causes the current value in the Timer 2 registers, TL2 and TH2, to be captured into registers RCAP2L and RCAP2H, respectively. In addition, the transition at T2EX causes bit EXF2 in T2CON to be set, and EXF2, like TF2, can generate an interrupt. The capture mode is illustrated in Figure 7. In the auto-reload mode there are again two options, which are selected by bit EXEN2 in T2CON.If EXEN2 = 0, then when Timer 2 rolls over it does not only set TF2 but also causes the Timer 2 register to be reloaded with the 16 bit value in registers RCAP2L and RCAP2H, which are preset by software. If EXEN2 = 1, then Timer 2 still does the above, but with the added feature that a 1-to-0 transition at external input T2EX will also trigger the 16 bit reload and set EXF2. The auto-reload mode is illustrated in Figure 8. Figure 7. Timer 2 in Capture Mode. Figure 8. Timer 2 in Auto-Reload Mode. |
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