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| MC68HC08AS32A Datasheet, PDF (59/296 Pages) Motorola, Inc – Microcontrollers | |||
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Freescale Semiconductor, Inc.
Analog-to-Digital Converter (ADC)
I/O Registers
Table 3-1. Mux Channel Select
ADCH4
ADCH3
ADCH2
ADCH1
ADCH0
Input Select
0
0
0
0
0
PTB0/ATD0
0
0
0
0
1
PTB1/ATD1
0
0
0
1
0
PTB2/ATD2
0
0
0
1
1
PTB3/ATD3
0
0
1
0
0
PTB4/ATD4
0
0
1
0
1
PTB5/ATD5
0
0
1
1
0
PTB6/ATD6
0
0
1
1
1
PTB7/ATD7
0
1
0
0
0
PTD0/ATD8
0
1
0
0
1
PTD1/ATD9
0
1
0
1
0
PTD2/ATD10
0
1
0
1
1
PTD3/ATD11
0
1
1
0
0
PTD4/ATD12
0
1
1
0
1
PTD5/ATD13
0
1
1
1
0
PTD6/ATD14/TCLK
Range 01111 ($0F) to 11010 ($1A)
Unused(1)
1
1
0
1
1
Reserved
1
1
1
0
0
Unused(1)
1
1
1
0
1
VREFH(2)
1
1
1
1
0
VSSA/VREFL(2)
1
1
1
1
1
ADC Power Off
1. If any unused channels are selected, the resulting ADC conversion will be unknown.
2. The voltage levels supplied from internal reference nodes as specified in the table are used to
verify the operation of the ADC converter both in production test and for user applications.
NOTE:
The ADC subsystem is turned off when the channel select bits are all set to one.
This feature allows for reduced power consumption for the MCU when the ADC
is not used. Reset sets all of these bits to a logic 1.
Recovery from the disabled state requires one conversion cycle to stabilize.
MC68HC08AS32A â Rev. 1
MOTOROLA
Analog-to-Digital Converter (ADC)
For More Information On This Product,
Go to: www.freescale.com
Data Sheet
59
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