MC9S12E128CFUE Datasheet, PDF (239/606 Pages) Freescale Semiconductor, Inc – MC9S12E128 Data Sheet

Chapter 7 Digital-to-Analog Converter (DAC8B1CV1)
7.2.1 DAO — DAC Channel Output
This pin is used as the analog output pin of the DAC8B1C module. The value represents the analog voltage
level between V_SSA and V_REF.
7.2.2 V_DDA — DAC Power Supply
This pin serves as the power supply pin.l
7.2.3 V_SSA — DAC Ground Supply
This pin serves as an analog ground reference to the DAC.
7.2.4 V_REF — DAC Reference Supply
This pin serves as the source for the high reference potential. Separation from the power supply pins
accommodates the filtering necessary to achieve the accuracy of which the system is capable.
7.2.5 V_RL — DAC Reference Ground Supply
This pin serves as the ground for the low reference potential. This pin is connected to V_SSA outside the
DAC module boundary to accommodate the filtering necessary to achieve the accuracy of which the
system is capable.
7.3 Memory Map and Registers
This section provides a detailed description of all memory and registers accessible to the end user.
7.3.1 Module Memory Map
Figure 7-2 summarizes the DAC8B1C memory map. The base address is defined at the chip level and the
address offset is defined at the module level.
Address
Name
Bit 7
0x0000
DACC0
R
DACE
W
0x0001
R
0
DACC1
W
0x0002
DACD (Left
Justified)
R
W
BIT 7
0x0003
DACD (Right R
Justified) W
BIT 7
6
DACTE
0
BIT 6
BIT 6
5
0
0
BIT 5
BIT 5
4
0
0
BIT 4
BIT 4
3
DJM
0
BIT 3
BIT 3
= Unimplemented or Reserved
Figure 7-2. DAC8B1C Register Summary
2
DSGN
0
1
DACWAI
0
Bit 0
DACOE
0
BIT 2
BIT 2
BIT 1
BIT 1
BIT 0
BIT 0
MC9S12E128 Data Sheet, Rev. 1.07
Freescale Semiconductor
239