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C505A Datasheet(PDF) 10 Page - Siemens Semiconductor Group |
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C505A Datasheet(HTML) 10 Page - Siemens Semiconductor Group |
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10 / 76 page  Semiconductor Group 1-7 Introduction C505A P4.0 P4.1 6 28 I/O I/O Port 4 is a 2-bit quasi-bidirectional port with internal pull-up arrangement. Port 4 pins that have 1’s written to them are pulled high by the internal pull-up transistors and in that state can be used as inputs. As inputs, port 4 pins being externally pulled low will source current (IIL, in the DC characteristics) because of the internal pullup transistors. The output latch corresponding to the secondary function RXDC must be programmed to a one (1) for that function to operate. The secondary functions are assigned to the two pins of port 4 as follows (C505CA only) : P4.0 / TXDC Transmitter output of CAN controller P4.1 / RXDC Receiver input of CAN controller XTAL2 14 O XTAL2 Output of the inverting oscillator amplifier. XTAL1 15 I XTAL1 Input to the inverting oscillator amplifier and input to the internal clock generator circuits. To drive the device from an external clock source, XTAL1 should be driven, while XTAL2 is left unconnected. To operate above a frequency of 16 MHz, a duty cycle of the etxernal clock signal of 50 % should be maintained. Minimum and maximum high and low times as well as rise/ fall times specified in the AC characteristics must be observed. *) I = Input O = Output Table 1-1 : Pin Definitions and Functions (cont’d) Symbol Pin Number I/O *) Function |
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Similar Description - C505A |
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