MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 223
MC9S12G
Manufacturer Part Number
MC9S12G
Description
Ignores external trigger. Performs one conversion sequence and stops.
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12G.pdf
(1160 pages)
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If the attenuation is turned on the resistive divider is connected to VSSA, VRH_INT and VRL_INT are
connected to intermediate voltage levels:
The attenuated reference voltage difference (VRH_INT - VRL_INT) equals 50% of the input reference
voltage difference (VRH - VSSA). With reference voltage attenuation the resolution of the ADC is
improved by a factor of 2.
Freescale Semiconductor
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
In attenuation mode the maximum ADC clock is reduced. Please refer to the
conditions in appendix A “ATD Accuracy”, table “ATD Conversion
Performance 5V range, RVA enabled”.
VRH_INT = 0.9 * (VRH - VSSA) + VSSA
VRL_INT = 0.4 * (VRH - VSSA) + VSSA
MC9S12G Family Reference Manual, Rev.1.01
NOTE
Reference Voltage Attenuator (RVAV1)
Eqn. 4-1
Eqn. 4-2
223
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