From 7c6361b5b173c87960c29232ff6516b0f57ca0c4 Mon Sep 17 00:00:00 2001 From: Christian Pointner Date: Tue, 10 May 2011 23:03:26 +0000 Subject: some changes at power control git-svn-id: https://svn.spreadspace.org/mur.sat@20 7de4ea59-55d0-425e-a1af-a3118ea81d4c --- doc/protocols/ihu-cpu.txt | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'doc/protocols') diff --git a/doc/protocols/ihu-cpu.txt b/doc/protocols/ihu-cpu.txt index 47fc55f..6cd9b74 100644 --- a/doc/protocols/ihu-cpu.txt +++ b/doc/protocols/ihu-cpu.txt @@ -6,10 +6,11 @@ Introduction ------------ The two controllers use SPI to communicate with each other. In -Addition to the 4 Lines needed for SPI there are 2 extra connections +addition to the 4 Lines needed for SPI there are 2 extra connections between IHU and CPU. One is for the IHU to reset the CPU. Holding -this pin low also prevents the CPU from running and therefore keeps -power consumption at a minimum. +this pin low prevents the CPU from running and therefore keeps +power consumption at a minimum, after a low to high transition the CPU +has to perform a hardware reset. The second line is used by the CPU to inform the IHU that it wishes to communicate. After this line goes high the IHU has to start the communication by starting the SPI clock. @@ -47,7 +48,9 @@ letters and replies use lower case. This command tells the CPU that the IHU is planning to shut down the CPU after ?? ms. The CPU has to write pending flash pages and put - payload hardware into deep sleep. This command doesn't send any data. + payload hardware into deep sleep. After finishing everything up the CPU + has to go into power down. + This command doesn't send any data. Expected response: 'f' -- cgit v1.2.3