| 摘要 |
PURPOSE:To receive easily an external control data by replacing plural control data converted in serial data and sent are replaced with control data from an external part at a data selecter provided on the way of a transmission line. CONSTITUTION:A P/S converting part 51 in a control part 68 converts control data in serial. A clock generating part 52 provides a clock to the converting part 51, at the same time the data and a clock is sent to an external interface IF part 69 respectively. The IF part 69 sends control data to a data selector 55, and a clock is supplied to a counter 56, and a replacing control part 57. The control part 57 controls the selector 55 according to a mode from a mode register 61 by timing corresponding to the counted value of a counter. External control data and status data supplied from a data bus, address bus and a write pulse are latched to a buffer register 60 and the register 61, respectively. Control data are converted by a shift register 59 into serial data, inputted to selector 55 by the control part 57, replaced with data from a control part 68 and sent to a controlled part 70. |
