MC9S12G Datasheet, PDF (222/1160 Pages) Freescale Semiconductor, Inc – Ignores external trigger. Performs one conversion sequence and stops.

Reference Voltage Attenuator (RVAV1)
4.6 Memory Map and Register Definition
4.6.1 Register Map
Table 4-1 shows the RVA register map.
Table 4-1. RVA Register Map
Global Address
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
0x0276
R
0
0
0
0
0
0
0
RVACTL
W
RVAON
= Unimplemented or Reserved
4.6.2 Register Descriptions
4.6.2.1 RVA Control Register (RVACTL)
Address 0x0276
7
R
0
W
Reset
0
1 _{Read: Anytime}
Write: Anytime
6
5
4
3
2
0
0
0
0
0
0
0
0
0
0
Figure 4-2. RVA Control Register (RVACTL)
Table 4-2. RVACTL Register Field Descriptions
Field
Description
0
RVA On —
RVAON This bit turns on the reference voltage attenuation.
0 RVA in bypass mode
1 RVA in attenuation mode
Access: User read/write¹
1
0
0
RVAON
0
0
4.7 Functional Description
The RVA is a prescaler for the ADC reference voltage. If the attenuation is turned off the resistive divider
is disconnected from VSSA, VRH_INT is connected to VRH and VRL_INT is connected to VSSA. In this
mode the attenuation is bypassed and the resistive divider does not draw current.
MC9S12G Family Reference Manual, Rev.1.01
222
Freescale Semiconductor
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.