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C515C Datasheet(PDF) 8 Page - Siemens Semiconductor Group |
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C515C Datasheet(HTML) 8 Page - Siemens Semiconductor Group |
8 / 69 page ![]() C515C Semiconductor Group 8 1997-07-01 P3.0-P3.7 15-22 15 16 17 18 19 20 21 22 I/O Port 3 is an 8-bit quasi-bidirectional I/O port with internal pullup resistors. Port 3 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 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 (asynch.) or data input/output (synch.) of serial interface P3.1 TXD Transmitter data output (asynch.) or clock output (synch.) of serial interface P3.2 INT0 External interrupt 0 input / timer 0 gate control input P3.3 INT1 External interrupt 1 input / timer 1 gate control input P3.4 T0 Timer 0 counter input P3.5 T1 Timer 1 counter input P3.6 WR WR control output; latches the data byte from port 0 into the external data memory P3.7 RD RD control output; enables the external data memory *) I = Input O = Output Table 1 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O*) Function P-MQFP-80 |
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