Serial data receiving device having a memory for storing a reception permit signal which enable or disable the device from hand-shaking with the transmitting device

DETAILED DESCRIPTION The present invention has been devised to solve the problems discussed above, and a principal object of the present invention is to provide a serial data transfer apparatus in which a receiving device controls the transmission of data in accordance with the conditions of the data reception thereof thereby to forcibly suspend the delivery for every serial data while a programmed operation of the device is not forced to stop.
And it is to provide a serial data receiving device having a function for controlling the transmission of data.
According to one aspect of the present invention, a serial data receiving device includes a first memory means which stores serial data after shifting the data bit by bit every time one bit of the data is inputted thereto and converts the serial data into parallel data when all the bits constituting the serial data are stored, a first detecting means which detects that all the bits of the serial data are stored in the first memory means, and a first control means which controls the reception of the serial data in accordance with the detection result by the first detecting means, thereby to control the transfer of the serial data.
The first control means is a first signal generating means which generates, for examples, a signal for hand-shaking with a transmitting device.
In the case where the receiving device is so constituted that, the first control means includes a second signal generating means which generates a transfer clock for transferring the serial data, the receiving device can receive the serial data synchronously with the transfer clock.
The detection result of the first detecting means may be sent to the first control means in a construction as follows.
A second memory means is additionally provided to store a reception permit signal for the serial data, which is set or reset in accordance with the detection result by the first detecting means, so that the first control means controls the reception of the serial data in accordance with stored contents in the second memory means