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Q67127-C1009 Datasheet(PDF) 9 Page - Infineon Technologies AG |
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Q67127-C1009 Datasheet(HTML) 9 Page - Infineon Technologies AG |
9 / 48 page Semiconductor Group 9 1997-04-01 C501 P3.0 – P3.7 11, 13–19 11 13 14 15 16 17 18 19 10–17 10 11 12 13 14 15 16 17 5, 7–13 5 7 8 9 10 11 12 13 I/O Port 3 is a quasi-bidirectional I/O port with internal pull-up resistors. Port 3 pins that have 1s written to them are pulled high by the internal pull-up resistors, and in that state they 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 pull-up resistors. Port 3 also contains the interrupt, timer, serial port 0 and external memory strobe pins which 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 R ×D receiver data input (asyn- chronous) or data input output (synchronous) of serial interface 0 P3.1 T ×D transmitter data output (asynchronous) or clock output (synchronous) of the serial interface 0 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 the write control signal lat- ches the data byte from port 0 into the external data memory P3.7 RD the read control signal enables the external data memory to port 0 *) I = Input O = Output Table 1 Pin Definitions and Functions (cont’d) Symbol Pin Number I/O*) Function P-LCC-44 P-DIP-40 P-MQFP-44 |
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