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The H8s have a twelve analog channels multiplexed to a single 10-bit Analog to Digital Converter.
Conversion Speed is 8.3 uS per channel.
Digital output is loaded to following REGs:
(12 Channels x 2 for Hi and Lo Byte)
Address REG Name
The H8 DSMs, as well as most MAF based H8 cars, have the following assignments:
Channel -> Sensor
0 -> Coolant Temp
1 -> Air Temp
2 -> Barometric Pressure
3 -> Front O2 Voltage
4 -> Rear O2 Voltage
5 -> Battery Voltage
6 -> Knock Sensor Voltage
7 -> Throttle Position Sensor
8 -> Unknown/Unused
9 -> Unknown/Unused
A -> Unknown/Unused
B -> Manifold Differential Pressure Sensor
10-bit precision is general not kept, usually values are reduced to 8-bit (0-255) value.
Analog sensor values are refreshed once per main operating loop,
with the exception of the Knock Sensor which is updated on CAS interrupts also.