mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 43

• Manufacturer Part Number: mc68hc908qf4
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

3.7.2 ADC Data Register
MC68HC908QF4 — Rev. 1.0
MOTOROLA
NOTE:
Recovery from the disabled state requires one conversion cycle to stabilize.
One 8-bit result register is provided. This register is updated each time an ADC
conversion completes.
Address: $003E
Reset:
Read:
Write:
should be taken when using a port pin as both an analog and a digital input
simultaneously to prevent switching noise from corrupting the analog signal.
The ADC subsystem is turned off when the channel select bits are all set to 1.
This feature allows for reduced power consumption for the MCU when the ADC
is not used. Reset sets all of these bits to a 1.
Freescale Semiconductor, Inc.
1. If any unused channels are selected, the resulting ADC conversion will be
2. The voltage levels supplied from internal reference nodes, as specified in the
For More Information On This Product,
CH4
Bit 7
Bit 7
↓
0
0
0
0
0
1
1
1
1
1
1
unknown.
table, are used to verify the operation of the ADC converter both in produc-
tion test and for user applications.
Analog-to-Digital Converter (ADC)
CH3
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0
0
0
0
0
↓
1
1
1
1
1
1
Figure 3-5. ADC Data Register (ADR)
Bit 6
6
CH2
Table 3-1. MUX Channel Select
↓
0
0
0
0
1
0
0
1
1
1
1
Bit 5
5
CH1
0
0
1
1
0
↓
1
1
0
0
1
1
Indeterminate after reset
Bit 4
4
CH0
↓
0
1
0
1
0
0
1
0
1
0
1
Bit 3
3
Channel
ADC
AD0
AD1
AD2
AD3
—
—
—
—
—
—
—
—
Analog-to-Digital Converter (ADC)
Bit 2
2
ADC power off
Input Select
Input/Output Registers
Unused
Reserved
Unused
V
V
Bit 1
PTA0
PTA1
PTA4
PTA5
DDA
SSA
1
(2)
(2)
(1)
Bit 0
Bit 0
Data Sheet
43