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C511 Datasheet(PDF) 9 Page - Siemens Semiconductor Group |
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C511 Datasheet(HTML) 9 Page - Siemens Semiconductor Group |
9 / 43 page C511 / C513 Semiconductor Group 9 P3.0-P3.7 11, 13-19 11 13 14 15 16 17 18 19 5, 7-13 5 7 8 9 10 11 12 13 I/O Port 3 is a bidirectional I/O port with internal pull-up resistors. Port 3 pins that have 1s written to them are pulled high by the internal pullup resistors, and in that state can be used as inputs. As inputs, port 3 pins being externally pulled low will source current ( I IL, in the DC characteristics) because of the internal pullup resistors. Port 3 also contains the interrupt, timer, serial port and external memory strobe pins that are used by various options. The output 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 3 as follows: P3.0 RXD Receiver data input (asynchronous) or data input/output (synchronous) of serial interface (USART) 1) P3.1 TXD Transmitter data output (USART) 1) (asynchronous) or clock output (synchronous) of serial interface P3.2 INT0 Interrupt 0 input / timer 0 gate control P3.3 INT1 Interrupt 1 input / timer 1 gate control P3.4 T0 Counter 0 input P3.5 T1 Counter 1 input P3.6 WR Write control signal : latches the data byte from port 0 into the external data memory P3.7 RD Read control signal : enables the external data memory to port 0 1) not available in the C511/511A XTAL2 20 14 – XTAL2 Output of the inverting oscillator amplifier. *) I = Input O = Output Table 3 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O*) Function P-LCC- 44 P-MQFP- 44 |
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