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

SAB 80C517A/83C517A-5Pin Definitions and Functions (cont’d)Symbol Pin Number I/O *) FunctionP-LCC-84P-MQFP-100-2P1.7 - P1.0 29 - 36 98 - 100,1, 6 - 9I/O Port 1is a bidirectional I/O port with internalpull-up resistors. Port 1 pins that have1 s written to them are pulled high by theinternal pull-up resistors, and in that statecan be used as inputs. As inputs, port 1pins being externally pulled low will sourcecurrent (I IL , in the DC characteristics)because of the internal pull-up resistors. Itis used for the low order address byteduring program verification. It also containsthe interrupt, timer, clock, capture andcompare pins that are used by variousoptions. The output latch must beprogrammed to a one (1) for that function tooperate (except when used for the comparefunctions).The secondary functions are assigned tothe port 1 pins as follows:– INT3/CC0 (P1.0): interrupt 3 input/compare 0 output /capture 0 input– INT4/CC1 (P1.1): interrupt 4 input /compare 1 output /capture 1 input– INT5/CC2 (P1.2): interrupt 5 input /compare 2 output /capture 2 input– INT6/CC3 (P1.3): interrupt 6 input /compare 3 output /capture 3 input– INT2/CC4 (P1.4): interrupt 2 input /compare 4 output /capture 4 input– T2EX (P1.5): timer 2 externalreload trigger input– CLKOUT (P1.6): system clock output– T2 (P1.7): counter 2 input* I = InputO = OutputSemiconductor Group 10