MC9S12G Datasheet, PDF (221/1160 Pages) Freescale Semiconductor, Inc – Ignores external trigger. Performs one conversion sequence and stops.

VRH
RVA
R
5R
4R
VSSA
Reference Voltage Attenuator (RVAV1)
STOP RVAON
VRH_INT
to ADC
VRL_INT
Figure 4-1. RVA Module Block Diagram
4.4 External Signals
The RVA has two external input signals, VRH and VSSA.
4.5 Modes of Operation
1. Attenuation Mode
The RVA is attenuating the reference voltage when enabled by the register control bit and the MCU
not being in STOP mode.
2. Bypass Mode
The RVA is in bypass mode either when disabled or during STOP mode. In these cases the resistor
ladder of the RVA is disconnected for power saving.
MC9S12G Family Reference Manual, Rev.1.01
Freescale Semiconductor
221
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.