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TSC87C52-16IAD датащи(PDF) 10 Page - TEMIC Semiconductors |
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TSC87C52-16IAD датащи(HTML) 10 Page - TEMIC Semiconductors |
10 / 24 page TSC87C52 10 Rev. C – 10 Sept 1997 Preliminary MATRA MHS Programmable Clock Output A 50% duty cycle clock can be programmed to come out on P1.0. This pin, besides being a regular I/O pin, has two alternate functions. It can be programmed to input external clock for Timer/Counter 2 or to output a 50% duty cycle clock from frequency fosc/218 to frequency fosc/4 (61 Hz to 4 MHz at a 16 MHz operating frequency). The clock–out frequency depends on the oscillator frequency and the reload value of Timer 2 capture registers RCAP2H and RCAP2L as shown in this equation: Oscillator frequency Clock–Out frequency= 4 ⋅ (65536 – RCAP2H,RCAP2L) To configure the Timer/Counter 2 as a clock generator, bit C/T2 in T2CON (bit location 1) must be cleared and bit T2OE must be set. Bit TR2 in T2CON starts and stops the timer (see Figure 7). T2OE is located in T2MOD at bit location 1 (see Table 5). In the clock–out mode, Timer 2 roll–overs will not generate an interrupt. This is similar to when Timer 2 is used as a baud–rate generator. It is possible to use Timer 2 as a baud–rate generator and as clock generator simultaneously. Note however, that the baud–rate and clock–out frequencies can not be determined independently from one another since they both use RCAP2H and RCAP2L. TR2 ÷ 2 OSC OVERFLOW T2EX EXF2 TH2 (8–bit) TL2 (8–bit) TIMER 2 INTERRUPT EXEN2 RCAP2H (8–bit) RCAP2L (8–bit) T2OE C/T2 T2 ÷ 2 Figure 7 Timer 2 Clock–Out Mode Table 5 T2MOD – Timer 2 Control Register (C9h) 765432 10 – – – – – – T2OE DCEN Symbol Description – Reserved Do not write 1 in these bits. T2OE Timer 2 Output Enable bit Set to program P1.0/T2 as clock output. Clear to program P1.0/T2 as clock input or I/O port. DCEN Decrement Enable bit Set to enable Timer 2 as up/down counter. Clear to disable Timer 2 as up/down counter. The reset value of T2MOD is XXXX XX00b. |
Аналогичный номер детали - TSC87C52-16IAD |
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Аналогичное описание - TSC87C52-16IAD |
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