The championship would be divided into two rounds - in each round, the teams played against each other once, and the four best teams qualified to the Semifinals, with their winners qualifying to the Finals. The winners of each round qualified to the Championship Finals.[1][2]
Updated to match(es) played on July 25, 1980. Source: RSSSF.com Rules for classification: 1) points; 2) wins; 3) goal difference; 4) number of goals scored.
Updated to match(es) played on October 26, 1980. Source: RSSSF.com Rules for classification: 1) points; 2) wins; 3) goal difference; 4) number of goals scored.
Updated to match(es) played on October 26, 1980. Source: RSSSF.com Rules for classification: 1) points; 2) wins; 3) goal difference; 4) number of goals scored.
Like in the previous year, the team with the fewest points would be relegated and the team with the second-fewest points would go to a playoff against the runner-up of the Second Level. as such, XV de Piracicaba was relegated and Francana had to dispute a playoff in neutral ground against Catanduvense.[4][5][6]