MC9S12GRMV1 Datasheet, PDF (262/1292 Pages) Freescale Semiconductor, Inc – MC9S12G Family Reference Manual and Data Sheet

Reference Voltage Attenuator (RVAV1)
VRH
RVA
R
5R
4R
VSSA
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.1.23
264
Freescale Semiconductor