Communication system, communication apparatus, and communication control method
First Claim
1. A communication system comprising:
- a master and a slave that can communicate with each other, said master including a first communication section for transmitting a start request signal to said slave, said slave including a second communication section for receiving the start request signal transmitted by said master, wherein said slave can take any of a start state in which said slave can communicate with said master, a communication control state in which at least said slave can receive the start request signal transmitted by said master and makes a transition to the start state upon reception of the start request signal, or a standby state in which power is less consumed than in the start state or the communication control state, and wherein said slave further comprises a state control section for repeatedly operating so that said slave in the standby state is switched to the communication control state at a predetermined timing and is switched to the standby state when the communication control state continues for a predetermined time period without receiving the start request signal.
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Accused Products
Abstract
A slave can take any of a start state in which the slave can communicate with a master, a communication control state in which at least the slave can receive a start request signal transmitted by the master and makes a transition to the start state upon reception of the start request signal, or a standby state in which power is less consumed than in the start state or the communication control state. The slave further includes a state control section for repeatedly operating so that the slave in the standby state is switched to the communication control state at a predetermined timing and is switched to the standby state when the communication control state continues for a predetermined time period without receiving the start request signal.
57 Citations
16 Claims
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1. A communication system comprising:
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a master and a slave that can communicate with each other, said master including a first communication section for transmitting a start request signal to said slave, said slave including a second communication section for receiving the start request signal transmitted by said master, wherein said slave can take any of a start state in which said slave can communicate with said master, a communication control state in which at least said slave can receive the start request signal transmitted by said master and makes a transition to the start state upon reception of the start request signal, or a standby state in which power is less consumed than in the start state or the communication control state, and wherein said slave further comprises a state control section for repeatedly operating so that said slave in the standby state is switched to the communication control state at a predetermined timing and is switched to the standby state when the communication control state continues for a predetermined time period without receiving the start request signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A communication apparatus as a slave that can communicate with a master, comprising:
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a communication section, when the master transmits a start request signal to said communication apparatus, for receiving the start request signal, wherein said communication apparatus can take any of a start state in which said communication apparatus can communicate with the master, a communication control state in which at least said communication apparatus can receive the start request signal transmitted by the master and makes a transition to the start state upon reception of the start request signal, or a standby state in which power is less consumed than in the start state or the communication control state, and wherein said communication apparatus further comprises a state control section for repeatedly operating so that said communication apparatus in the standby state is switched to the communication control state at a predetermined timing and is switched to the standby state when the communication control state continues for a predetermined time period without receiving the start request signal. - View Dependent Claims (14)
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15. A communication control method in a slave that can communicate with a master, the method comprising:
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making the slave a start state in which the slave can communicate with the master;
making the slave a communication control state in which at least the slave can receive a start request signal transmitted by the master and makes a transition to the start state upon reception of the start request signal;
making the slave a standby state in which power is less consumed than in the start state or the communication control state; and
performing repeatedly an operation of switching from the standby state to the communication control state at a predetermined timing and switching to the standby state when the communication control state continues for a predetermined time period without receiving the start request signal. - View Dependent Claims (16)
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Specification