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Q67120-C0581 데이터시트(PDF) 34 Page - Siemens Semiconductor Group |
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Q67120-C0581 데이터시트(HTML) 34 Page - Siemens Semiconductor Group |
34 / 57 page SAB 80C515A/83C515A-5 Semiconductor Group 33 I/O Ports The SAB 80C515A has six 8-bit I/O ports and one input port. Port 0 is an open-drain bidirectional I/O port, while ports 1 to 5 are quasi-bidirectional I/O ports with internal pull-up resistors. That means, when configured as inputs, ports 1 to 5 will be pulled high and will source current when externally pulled low. Port 0 will float when configured as input. Port 0 and port 2 can be used to expand the program and data memory externally. During an access to external memory, port 0 emits the low-order address byte and reads/writes the data byte, while port 2 emits the high-order address byte. In this function, port 0 is not an open-drain port, but uses a strong internal pull-up FET. Ports 1, 3 and 4 are provided for several alternate functions, as listed below: The SAB 80C515A has one dual-purpose input port. The ANx lines of port 6 in the SAB 80C515 can individually be used as analog or digital inputs. Reading the special function register P6 allows the user to input the digital values currently applied to the port pins. It is not necessary to select these modes by software; the voltages applied at port 6 pins can be converted to digital values using the A/D converter and at the same time the pins can be read via SFR P6. It must be noted, however, that the results in port P6 bits will be indeterminate if the levels at the corresponding pins are not within their VIL/VIH specifications. Furthermore, it is not possible to use port P6 as an output port. Special function register P6 is located at address 0DBH. In Hardware Power Down Mode the port pins and several control lines enter a floating state. For more details see the section about Hardware Power Down Mode. Port Symbol Function P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 P3.6 P3.7 P4.0 INT3/CC0 INT4/CC1 INT5/CC2 INT6/CC3 INT2 T2EX CLKOUT T2 RxD TxD INT0 INT1 T0 T1 WR RD ADST External interrupt 3 input, compare 0 output, capture 0 input External interrupt 4 input, compare 1 output, capture 1 input External interrupt 5 input, compare 2 output, capture 2 input External interrupt 6 input, compare 3 output, capture 3 input External interrupt 2 input Timer 2 external reload trigger input System clock output Timer 2 external count or gate input Serial port’s receiver data input (asynchronous) or data input /output (synchronous) Serial port’s transmitter data output (asynchronous) or clock output (synchronous) External interrupt 0 input, timer 0 gate control External interrupt 1 input, timer 1 gate control Timer 0 external counter input Timer 1 external counter input External data memory write strobe External data memory read strobe A/D Converter, external start of conversion |
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