| 摘要 |
PURPOSE:To relieve the load required for transmission processing of a CPU by storing temporarily parallel data in plural units outputted once from the CPU and reading sequentially it as a parallel data in one unit to input it to a printer. CONSTITUTION:A parallel data in 16-bit is outputted to a data bus DB of the CPU. A latch pulse is outputted to an output port P4, a high-order 8-bit is latched in a latch LA1 and a low-order 8-bit is latched to a latch LA2. The latched data is transmitted sequentially to the printer as a parallel data in low-order 8-bit and a high-order 8-bit by reading ports P2,P3 and bringing it to a permitting level. |
