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TS68HC901 데이터시트(PDF) 6 Page - STMicroelectronics |
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TS68HC901 데이터시트(HTML) 6 Page - STMicroelectronics |
6 / 42 page TAO,TBO, TCO,TDO: Timer Outputs. Each of the four timers has an output which can produce a square wave. The output will change states each timer cycle ; thus one full pe- riod of the timer out signal is equal to two timer cycles. TAO or TBO can be reset (logic ”O”) by a write to TACR, or TBCR respectively. XTAL1, XTAL2 : Timer Clock inputs. A crystal can be connected between XTAL1 and XTAL2, or XTAL1 can be driven with a TTL level clock. When driving XTAL1 with a TTL le- vel clock, XTAL2 must be allowed to float. When using a crystal, external capacitors are required. See figure 35. All chip ac- cesses are independent of the timer clock. TAI,TBI : Timer A, B inputs. These inputs are control signals for timers A and B in the pulse width measurement mode and e- vent count mode. These signals gene- rate interrupts at the same priority level as the general purpose I/O interrupt lines I4 and I3, respectively. I4 and I3 do not have interrupt capability when the timers are operated in the pulse width measure- ment mode or the event count mode - un- der these conditions I4 and I3 may only be used for I/O. Refer to paragraph TI- MERS for further information. Signal Name Mnemonic I/O Active Power Input VCC Input High Ground GND Input Low Clock CLK Input N/A Chip Select CS Input Low Data Strobe DS Input Low Read/Write R/W Input Read-High / Write-Low Data tranfer Acknowledge DTACK Output Low Register Select Bus RS1-RS5 Input N/A Data Bus D0-D7 I/O N/A Reset RESET Input Low Interrupt Request IRQ Output Low Interrupt Acknowledge IACK Input Low Interrupt Enable In IEI Input Low Interrupt Enable Out IEO Output Low General Purpose I/O - Interrupt Lines I0-I7 I/O N/A Timer Clock XTAL1, XTAL2 Input High Timer Inputs TAI, TBI Input N/A Timer Outputs TAO, TBO, TCO, TDO Output N/A Serial Input SI Input N/A Serial Output SO Output N/A Receiver Clock RC Input N/A Transmitter Clock TC Input N/A Receiver Ready RR Output Low Transmitter Ready TR Output Low MPX MPX Input N/A SIGNAL SUMMARY. ® TS68HC901 6/42 |
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