Renesas H8S/2161B (H8S/2140B group)
The Renesas H8S/2161B is the embedded controller chip found in many ThinkPad models. It controls various low-bandwidth devices such as keyboard, mouse, system fan, thermal sensors, accelerometer, intelligent Li-Ion batteries, LEDs and switches. It hosts the firmware responsible for the Active Protection System and advanced battery control.
- Renesas H8S/2140B group Hardware manual
- Renesas H8S/2600 series, H8S/2000 series software manual
- Renesas H8S series Technical Q&A application note
- A partial disassembly of the firmware running on this embedded controller is available in this thread.
Firmware bugs are listed in the Embedded Controller Firmware page. Firmware hacking is taking place in thinkpads.com, see above for links.
Models containing this chip
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