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Renesas H8S/2161B (H8S/2140B group)

The Renesas H8S/2161B is the embedded controller chip found in T43 and T43p models. It controls various low-bandwidth devices such as keyboard, mouse, fan, LEDs, thermal sensors, Active Protection System accelerometer, battery status and switches.

Hardware manual
A partial disassembly of the firmware running on this embedded controller is available in this thread.

ATTENTION!

The Flash-RAM of the H8S/2161B is rated for just 100 write cycles

Models containing this chip

Photos (click to see full size)

H8S/2161BV in T43