High-Performance SAB 80C517A/83C517A-5 8-Bit CMOS Single ...

SAB 80C517A/83C517A-5Pin Definitions and Functions (cont’d)Symbol Pin Number I/O *) FunctionP6.0 - P6.7 70 - 77 46 - 50,54 - 56I/O Port 6is a bidirectional I/O port with internal pullupresistors. Port 6 pins that have 1 swritten to them are pulled high by theinternal pull-up resistors, and in that statecan be used as inputs. As inputs, port 6pins being externally pulled low will sourcecurrent (I IL , in the DC characteristics)because of the internal pull-up resistors.Port 6 also contains the external A/Dconverter control pin and the transmit andreceive pins for serial channel 1. Theoutput latch corresponding to a secondaryfunction must be programmed to a one (1)for that function to operate.The secondary functions are assigned tothe pins of port 6, as follows:– ADST (P6.0): external A/D converterstart pin– R × D1 (P6.1): receiver data inputof serial interface 1– T × D1 (P6.2): transmitter data outputof serial interface 1P8.0 - P8.3 78 - 81 57 - 60 I Port 8is a 4-bit unidirectional input port. Port pinscan be used for digital input, if voltagelevels meet the specified input high/lowvoltages, and for the higher 4-bit of themultiplexed analog inputs of the A/Dconverter, simultaneously* I = InputO = OutputP-LCC-84P-MQFP-100-2Semiconductor Group 14