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SAF-C509-LM Datasheet(PDF) 7 Page - Siemens Semiconductor Group |
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SAF-C509-LM Datasheet(HTML) 7 Page - Siemens Semiconductor Group |
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7 / 74 page  C509-L Semiconductor Group 6 P9.0 - P9.7 74-77, 5-2 I/O Port 9 is an 8-bit quasi-bidirectional I/O port with internal pullup resistors. Port 9 pins that have 1's written to them are pulled high by the internal pullup resistors, and in that state can be used as inputs. As inputs, port 9 pins being externally pulled low will source current (I IL, in the DC characteristics) because of the internal pullup resistors. Port 9 can also be switched into a bidirectional mode, in which CMOS levels are provided. In this bidirectional mode, each port 1 pin can be programmed individually as input or output. Port 9 also serves alternate compare functions. The out- put latch corresponding to a secondary function must be programmed to a one (1) for that function to operate. The secondary functions are assigned to the pins of port 9 as follows : P9.0-P9.7 CC10-CC17 Compare/capture channel 0-7 output/input XTAL2 12 – XTAL2 is the input to the inverting oscillator amplifier and input to the internal clock generator circuits. When supplying the C509-L with an external clock source, XTAL2 should be driven, while XTAL1 is left unconnected. A duty cycle of 0.4 to 0.6 of the clock signal is required. Minimum and maximum high and low times as well as rise/fall times specified in the AC characteristics must be observed. XTAL1 13 – XTAL1 Output of the inverting oscillator amplifier. This pin is used for the oscillator operation with crystal or ceramic resonartor *) I = Input O = Output Table 1 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O*) Function |
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