Datasheet

Digital Analog Converter (DAC_8B5V)
MC9S12G Family Reference Manual, Rev.1.23
578 Freescale Semiconductor
17.4.2.2 Analog Output Voltage Level Register (DACVOL)
17.4.2.3 Reserved Register
17.5 Functional Description
17.5.1 Functional Overview
The DAC resistor network and the operational amplifier can be used together or stand alone. Following
modes are supported:
Module Base + 0x0002 Access: User read/write
1
1
Read: Anytime
Write: Anytime
76543210
R
VOLTAGE[7:0]
W
Reset 00000000
Figure 17-4. Analog Output Voltage Level Register (DACVOL)
Table 17-4. DACVOL Field Description
Field Description
7:0
VOLTAGE[7:0]
VOLTAGE — This register defines (together with the FVR bit) the analog output voltage. For more detail see
Equation 17-1 and Equation 17-2.
Module Base + 0x0007 Access: User read/write
1
1
Read: Anytime
Write: Only in special mode
76543210
R
Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved
W
Reset xxxxxxxx
Figure 17-5. Reserved Registerfv_dac_8b5v_RESERVED
Table 17-5. DAC Modes of Operation
DACM[2:0]
Description
Submodules Output
DAC resistor
network
Operational
Amplifier
DACU AMP
Off 000 disabled disabled disconnected disconnected