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SAB-C541U-1EN Datasheet(PDF) 9 Page - Siemens Semiconductor Group |
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SAB-C541U-1EN Datasheet(HTML) 9 Page - Siemens Semiconductor Group |
9 / 65 page Semiconductor Group 9 1997-10-01 C540U C541U P3.0 - P3.7 11, 13 - 19 13, 16 - 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 / LED2 LED2 output P3.1 / DADD Device attached input 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 XTAL2 20 23 – XTAL2 is the output of the inverting oscillator amplifier. This pin is used for the oscillator operation with crystal or ceramic resonator. XTAL1 21 24 – XTAL1 is the 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. 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 2 Pin Definitions and Functions (cont’d) Symbol Pin Numbers I/O*) Function P-LCC-44 P-SDIP-52 |
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