US 11,914,871 B2
Electronic control device and program-update method
Motoki Tatsumi, Hitachinaka (JP); Mayumi Maeda, Hitachinaka (JP); and Toshihisa Arai, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 17/421,670
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Jan. 27, 2020, PCT No. PCT/JP2020/002808
§ 371(c)(1), (2) Date Jul. 8, 2021,
PCT Pub. No. WO2020/158675, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 2019-011939 (JP), filed on Jan. 28, 2019.
Prior Publication US 2022/0091762 A1, Mar. 24, 2022
Int. Cl. G06F 3/06 (2006.01)
CPC G06F 3/0631 (2013.01) [G06F 3/0604 (2013.01); G06F 3/0634 (2013.01); G06F 3/0659 (2013.01); G06F 3/0679 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electronic control device comprising a nonvolatile memory having allocated two storage areas that are exclusively switchable between an active state and an inactive state, the two storage areas being set such that in a state in which a program is written in the storage area in the active state, a program is written for updating to the storage area in the inactive state in response to an instruction from an external device, followed by switching the storage area in the active state to the inactive state and switching the storage area in the inactive state to the active state, wherein
when the program written in the storage area in the active state differs from the program written in the storage area in the inactive state, the program written in the storage area switched to the active state is copied to the storage area in the inactive state, and
when the storage area in the inactive state is unused, arbitrary data is written in the storage area in the inactive state.