Patent ID: 11972835
Assignee: DENSO TEN LIMITED
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 4:
5. A port sampling system comprising:
a microcomputer having a normal state and a sleep state; and
a latch circuit device latching an input signal to the microcomputer and transmitting the latched signal to the microcomputer,
wherein the microcomputer comprises:
a control unit shifting the microcomputer to the normal state or the sleep state, and
a reception receiving the input signal from the latch circuit device, and

wherein the latch circuit device comprises:
a latch circuit latching the input signal to the microcomputer;
a detection circuit detecting the input signal during the sleep state;
a wake-up circuit outputting a wake-up signal to the microcomputer in response to the detection signal;
a sampling circuit having a sampling input to receive the input signal from the latch circuit;
a transmission circuit having a transmission input to receive the input signal from the sampling circuit and to output the input signal to the microcomputer in response to the wake-up signal; and
a release circuit outputting a latch release signal to the latch circuit upon input signal is-being read to the microcomputer,

wherein, in the normal state, the sampling circuit periodically receives a read request signal from the microcomputer and receives the input signal from the latch circuit in response to the read request signal, and the transmission circuit receives the input signal from the sampling circuit to output the input signal to the microcomputer.