SX User’s Manual Rev. 3.1 20 © 2000 Scenix Semiconductor, Inc. All rights reserved. www.scenix.com Chapter 1 Overview Table 1-2  Pin Descriptions Name  Pin
Type Input Levels Description RA0-RA7 I/O TTL/CMOS Port A bidirectional I/O pin; symmetrical source / sink
capability RB0 I/O TTL/CMOS/ST Port B bidirectional I/O pin; MIWU input; comparator
output RB1 I/O TTL/CMOS/ST Port B bidirectional I/O Pin; MIWU input; comparator
negative input RB2 I/O TTL/CMOS/ST Port B bidirectional I/O pin; MIWU input; comparator
positive input RB3-RB7 I/O TTL/CMOS/ST Port B bidirectional I/O pins; MIWU inputs RC0-RC7 I/O TTL/CMOS/ST Port C bidirectional I/O pins RD0-RD7 I/O TTL/CMOS/ST Port D bidirectional I/O pins RE0-RE7 I/O TTL/CMOS/ST Port E bidirectional I/O pins RTCC I ST Input to Real Time Clock/Counter MCLR I ST Master Clear reset input – active low OSC1/In/Vpp I ST Crystal oscillator input - external clock source input OSC2/Out O CMOS Crystal oscillator output – in R/C mode, internally
pulled to Vdd through weak pullup Vdd P NA Positive supply pins Vss P NA Ground pins