| 摘要 |
<p>PURPOSE:To increase a degree of freedom for contriving reduction in power consumption by using an execution of instruction suspending mode, by setting an operational mode to the suspending mode by changing a terminal from ''0'' to ''1'' and releasing the suspending mode by changing the terminal from ''1'' to ''0''. CONSTITUTION:When the signal of a terminal 1 rises at the point (a) of the figure, an FF2 is set and another FF4 is also set with a little time lag. When the FFs 2 and 4 are set, the output of an oscillator 5 is suppressed at a gate 6 and no clock for synchronism is supplied and, as a result, power consumption is reduced. When the signal of the terminal 1 falls at the point (b), an FF3 is set and the FF4 is reset with a little time lag and, as a result, the output signal of the oscillator 5 is outputted from the gate 6. If an execution of instruction suspending instruction is executed in the section (c), the FF4 is set and supply of the clock for synchronism is suppressed and, as a result, power consumption is reduced. To escape from this condition, a fall signal is given to the terminal 1 as indicated at the point (d). When the signal is given, the clock for synchronism is again outputted from the gate 6 and execution is restarted from the instruction of the address next to the address executing the execution of instruction suspending instruction.</p> |
