Microcomputer including CPU and serial data communication unit o

Details Microcomputer including CPU and serial data communication unit o Microcomputer including CPU and serial data communication unit o

1994-11-23

1996-04-09

Lall, Parshotam S.

Boots, shoes, and leggings

395842, 395878, 364DIG1, G06F 1338

Patent

active

055070019

ABSTRACT:
A microcomputer performs serial data transfer for a peripheral device in synchronism with machine cycles of the CPU without requesting an interrupt routine of the CPU. The microcomputer incorporates an improved serial data communication unit having a serial data terminal and a serial clock terminal coupled to the peripheral device. The CPU supplies a transfer start command to the serial data communication unit when it executes a serial data communication instruction. A serial clock control circuit in the serial data communication unit responds to the transfer start command to supply the clock terminal with a serial clock signal having the same frequency as the clock signal of the CPU in synchronism with the beginning of a certain machine cycle. A data transfer control circuit responds to the transfer start command and operates, in a first mode, to cause a shift register to output data stored therein to the serial data terminal in synchronism with the serial clock signal and, in a second mode, to cause the shift register to capture data appearing at the serial data terminal in synchronism with the serial clock signal.

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