英語(yǔ)翻譯
Port 1 and port 2 are each 8-bit wide and have identical characteristics.Data written to these ports are statically latched and remains unchanged until read.As input port they are non-latching,i.e.inputs must be present until read by an input instruction.Inputs are fully TTL compatible and output will drive one standard TTL load.
Timer/Counter The 8048 contains a counter to aid user in counting external events and generating accurate time delays without placing a burden on the processor for these function.The 8-bit binary counter is presettable and readable with two MOV instructions which transfer the contents of the accumulator to the counter and vice versa.