|
(11) | EP 2 290 822 A8 |
(12) | CORRECTED EUROPEAN PATENT APPLICATION |
Note: Bibliography reflects the latest situation |
|
|
|
|
|||||||||||||||||||||||||
|
(54) | Counter circuit, AD conversion method, AD converter, semiconductor device for detecting distribution of physical quantities, and electronics apparatus |
(57) An asynchronous counter that is capable of switching count mode includes flip-flops,
and three-input single-output tri-value switches respectively provided between the
adjacent pairs of the flip-flops. The tri-value switches switch among three values,
namely, non-inverting outputs and inverting outputs of the flip-flops and a power
supply level. Each of the tri-value switches switch among the three input signals
according to two-bit control signals, and input a selected signal to a clock terminal
of a subsequent flip-flop. When count mode is switched according to the control signals,
a count value immediately before the mode switching is set as an initial value, and
counting after the mode switching is started from the initial value.
|