PURPOSE: To perform good responsive control at rapid change of engine speed, by fetching updated angular pulse data to a central processing unit in the updated timing at each time of updating an angular pulse signal counted within a prescribed time band.
CONSTITUTION: An interruption control circuit 21 is input with a detection signal TKS obtained in a rise-up detector circuit 11, and its output is fed to a central processing unit (CPU) 8 through a data bus 9 and address bus 13. That is, the interruption conrol circuit 21 responds to incoming of the rise-up detection signal TKS, output from the rise-up detector circuit 11, to feed an angular pulse data interruption request signal IS to the CPU8. Further an interruption decision register 22 is arranged to the interruption control circuit 21, and a prescribed bit of the interruption decision register 22 is made "1" simultaneously with occurrence of an interruption request signal, then the angular pulse interruption request signal IS is identified.
OSHIAGE KATSUNORI
YAMAMOTO AKITO
HOSAKA AKIO
| JPS4741767A |