MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 236
MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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Analog-to-Digital Converter (ADC)
Technical Data
236
NOTE:
ADCH[4:0] — ADC Channel Select Bits
Recovery from the disabled state requires one conversion cycle to
stabilize.
The voltage levels supplied from internal reference nodes, as specified
in
in production test and for user applications.
NOTE: If any unused channels are selected, the resulting ADC conversion will be unknown
ADCH4
Table
ADCH[4:0] form a 5-bit field which is used to select one of the eight
ADC channels, ATD7–ATD0. The channels are detailed in
Table
analog and 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 being used.
Freescale Semiconductor, Inc.
0
0
0
0
0
0
0
0
0
1
1
1
1
For More Information On This Product,
or reserved.
14-1, are used to verify the operation of the ADC converter both
14-1. Care should be taken when using a port pin as both an
Analog-to-Digital Converter (ADC)
ADCH3
Go to: www.freescale.com
0
0
0
0
0
0
0
0
1
1
1
1
1
Table 14-1. Mux Channel Select
ADCH2
0
0
0
0
1
1
1
1
0
1
1
1
1
ADCH1
0
0
1
1
0
0
1
1
0
0
0
1
1
ADCH0
0
1
0
1
0
1
0
1
0
0
1
0
1
MC68HC908AB32
ADC power off
Input Select
PTB0/ATD0
PTB1/ATD1
PTB2/ATD2
PTB3/ATD3
PTB4/ATD4
PTB5/ATD5
PTB6/ATD6
PTB7/ATD7
Reserved
V
V
REFH
REFL
MOTOROLA
—
Rev. 1.0
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