Electronic watch
Provided is an electronic watch capable of surely acquiring a movement start position and a stop position of a hand when the hand moves at high speed such as a case of manual correction by a winding stem or the like, while reducing a load on a CPU. The electronic watch includes: a decode circuit for outputting data corresponding to regions acquired by segmenting a movement range of the hand; and a position information circuit for automatically acquiring region data corresponding to the movement start position of the hand and region data corresponding to the stop position thereof and sending a notification to the CPU when acquiring both the data. In this manner, the CPU can stop until the acquisition of both the data, thereby reducing the load on the CPU.
1. An electronic watch, comprising:
an indicator;
a decode circuit configured to segment a whole movable region of the indicator into at least a region A having predetermined width before a specific position and a region B having predetermined width after the specific position, and output region data, said region data indicates in which position the indicator is in, within at least the region A and the region B;
a position information circuit configured to acquire movement start region data corresponding to a movement start position of the indicator and stop region data corresponding to a stop position after start of movement, and configured to output, when the movement start region data or the stop region data are acquired, an acquisition signal indicating that one or both of the movement start region data and stop region data are acquired; and
a control unit configured to acquire the movement start region data and the stop region data from the position information circuit in response to the acquisition signal from the position information circuit, and configured to perform processing including a determination whether the indicator passes the specific position and a determination of a movement direction of the indicator.
2. The electronic watch according to claim 1 , wherein:
the position information circuit comprises a start circuit configured to acquire the movement start region data, and a stop circuit configured to acquire the stop region data; and wherein
the stop circuit stops itself during an operation of the start circuit, and starts to operate after the movement start region data is acquired by the start circuit.
3. The electronic watch according to claim 2 , wherein the acquisition signal is output from the stop circuit when the stop region data is acquired by the stop circuit.
4. The electronic watch according to claim 2 wherein:
the start circuit compares the region data and previous stop region data at a predetermined timing, determines that the movement starts when it is determined that the region data and the previous stop region data do not match with each other, and stores a value of the region data at that time as the movement start region data; and
after the start circuit stores the region data as the movement start region data, the stop circuit fetches the region data at a predetermined interval, determines that the movement stops when the fetched region data remains the same for a predetermined period of time or longer, and stores a value of the region data at that time as the stop region data.
5. The electronic watch according to claim 4 ,
wherein the whole movable region of the indicator is segmented within a limited region around the specific position in order to determine that the indicator passes the specific position, and is divided into a plurality of effective regions for outputting different pieces of the region data and a single invalid region other than the plurality of effective regions,
the electronic watch further comprising:
an invalid region detection circuit configured to:
determine whether or not the movement start region data and the stop region data are invalid region data corresponding to the invalid region; and
replace, when the movement start region data is the invalid region data, the movement start region data with region data of one of the plurality of effective regions that appears next to the invalid region in a movement direction of the indicator, and replace, when the stop region data is the invalid region data, the stop region data with region data of one of the plurality of effective regions that appears before the invalid region in the movement direction of the indicator,
wherein the predetermined period of time for determining the stop is set to be shorter than a time required for the indicator to pass the invalid region.
6. The electronic watch according to claim 4 wherein the stop circuit comprises:
a timer for measuring the predetermined period of time for determining when the movement stops, and
wherein the timer is configured to set a plurality of count-up values.
7. The electronic watch according to claim 2 , wherein the whole movable region of the indicator is segmented within a limited region around the specific position in order to determine that the indicator passes the specific position, and is divided into a plurality of effective regions for outputting different pieces of the region data and a single invalid region other than the plurality of effective regions,
the electronic watch further comprising:
an invalid region detection circuit configured to:
determine whether or not the movement start region data and the stop region data are invalid region data corresponding to the invalid region; and
replace, when the movement start region data is the invalid region data, the movement start region data with region data of one of the plurality of effective regions that appears next to the invalid region in a movement direction of the indicator, and replace, when the stop region data is the invalid region data, the stop region data with region data of one of the plurality of effective regions that appears before the invalid region in the movement direction of the indicator,
wherein:
the start circuit compares the region data and previous stop region data at a predetermined timing, determines that the movement starts when it is determined that the region data and the previous stop region data do not match with each other, and stores a value of the region data at that time as the movement start region data; and
after the start circuit stores the region data as the movement start region data, the stop circuit fetches the region data at a predetermined interval, determines that the movement stops when the fetched region data remains the same for a predetermined period of time or longer, and stores a value of the region data at that time as the stop region data.
8. The electronic watch according to claim 7 ,
wherein the predetermined period of time for determining the stop is set to be shorter than a time required for the indicator to pass the invalid region.
9. The electronic watch according to claim 1 , wherein the whole movable region of the indicator is segmented within a limited region around the specific position in order to determine that the indicator passes the specific position, and is divided into a plurality of effective regions for outputting different pieces of the region data and a single invalid region other than the plurality of effective regions.
10. The electronic watch according to claim 9 , further comprising:
an invalid region detection circuit configured to:
determine whether or not the movement start region data and the stop region data are invalid region data corresponding to the invalid region; and
replace, when the movement start region data is the invalid region data, the movement start region data with region data of one of the plurality of effective regions that appears next to the invalid region in a movement direction of the indicator, and replace, when the stop region data is the invalid region data, the stop region data with region data of one of the plurality of effective regions that appears before the invalid region in the movement direction of the indicator.
11. The electronic watch according to claim 1 , wherein said determination of the movement direction of the indicator is based on the start region data position data, the stop region position data and a third region position data.