mc68hc908sr12 Freescale Semiconductor, Inc, mc68hc908sr12 Datasheet - Page 227

• Manufacturer Part Number: mc68hc908sr12
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

14.7.2 Analog Module Gain Control Register (AMGCR)
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor
Address:
OPCH1–OPCH0 — Amplifier Channel Select Control Bits
AMIEN — Analog Module Interrupt Enable
DO[2:0] — DC Offset Control Bits
The analog module gain control register (AMGCR) selects the two gains
for the two-stage amplifier.
Reset:
Read:
Write:
Figure 14-4. Analog Module Gain Control Register (AMGCR)
These read/write bits select the input source to be amplified by the
two-stage amplifier. Reset clears the OPCH1 and OPCH0 bits.
Setting this bit will enable the CDIF and OPIF flags to generate an
CPU interrupt requests. Reset clears the AMIEN bit.
Set these bits to zero for optimum analog module performance.
OPCH1
1 = Analog module CPU interrupt requests enabled
0 = Analog module CPU interrupt requests disabled
0
0
1
1
GAINB3
$000F
Bit 7
Table 14-2. Amplifier Channel Select Control bits
0
OPCH0
GAINB2
0
1
0
1
Analog Module
6
0
GAINB1
TSOUT (internal)
5
0
Input Source
OPIN1/ATD0
OPIN2/ATD1
V
SSAM
GAINB0
4
0
GAINA3
3
0
Internal temperature sensor
External negative reference
Analog Module I/O Registers
GAINA2
2
0
External pin
External pin
Comments
GAINA1
1
0
Analog Module
Data Sheet
GAINA0
Bit 0
0
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