Revision # 1.20   Modifications made on May 30, 2006

• 特性部分增加了20-pin DIP/ SOP 的封装，并修改了引脚图及其相关部分

Revision # 1.10   Modifications made on March 24, 2006

• 删除输入输出中章节中PB中高4位和PD口高7位的相关描述

Revision # 1.00   This was posted on February 6, 2006