MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 470

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Digital Analog Converter (DAC_8B5V)
15.2
The DAC_8B5V module is a digital to analog converter. The converter works with a resolution of 8 bit and
generates an output voltage between VRL and VRH.
The module consists of configuration registers and two analog functional units, a DAC resistor network
and an operational amplifier.
The configuration registers provide all required control bits for the DAC resistor network and for the
operational amplifier.
The DAC resistor network generates the desired analog output voltage. The unbuffered voltage from the
DAC resistor network output can be routed to the external DACU pin. When enabled, the buffered voltage
from the operational amplifier output is available on the external AMP pin.
The operational amplifier is also stand alone usable.
Figure 15-1
15.2.1
The DAC_8B5V module includes these distinctive features:
15.2.2
The DAC_8B5V module behaves as follows in the system power modes:
470
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1. CPU run mode
2. CPU stop mode
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
Term
VRH
FVR
SSC
1 digital-analog converter channel with:
— 8 bit resolution
— full and reduced output voltage range
— buffered or unbuffered analog output voltage usable
operational amplifier stand alone usable
The functionality of the DAC_8B5V module is available.
Independent from the mode settings, the operational amplifier is disabled, switch S1 and S2 are
open.
Introduction
Features
Modes of Operation
shows the block diagram of the DAC_8B5V module.
High Reference Voltage
Full Voltage Range
Special Single Chip
MC9S12G Family Reference Manual,
Table 15-2. Terminology (continued)
Meaning
Rev.1.01
Freescale Semiconductor