Datasheet

Chapter 7 Digital-to-Analog Converter (DAC8B1CV1)
MC9S12E128 Data Sheet, Rev. 1.07
Freescale Semiconductor 239
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 65432 1Bit 0
0x0000 DACC0
R
DACE
DACTE 0 0
DJM DSGN DACWAI DACOE
W
0x0001 DACC1
R0 00000 0 0
W
0x0002
DACD (Left
Justified)
R
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
W
0x0003
DACD (Right
Justified)
R
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
W
= Unimplemented or Reserved
Figure 7-2. DAC8B1C Register Summary