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Analog-to-Digital Converter (S08ADC12V1)
MCF51QE128 MCU Series Reference Manual, Rev. 3
220 Freescale Semiconductor
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Figure 11-2. ADC Block Diagram
11.2 External Signal Description
The ADC module supports up to 28 separate analog inputs. It also requires four supply/reference/ground
connections.
Table 11-2. Signal Properties
Name Function
AD27–AD0 Analog Channel inputs
V
REFH
High reference voltage
V
REFL
Low reference voltage
V
DDAD
Analog power supply
V
SSAD
Analog ground
AD0
• • •
AD27
V
REFH
V
REFL
ADVIN
ADCH
Control Sequencer
initialize
sample
convert
transfer
abort
Clock
Divide
ADCK
÷2
Async
Clock Gen
Bus Clock
ALTCLK
ADICLK
ADIV
ADACK
ADCO
ADLSMP
ADLPC
MODE
complete
Data Registers
SAR Converter
Compare Value Registers
Compare
Value
Sum
AIEN
COCO
Interrupt
AIEN
COCO
ADTRG
1
2
1 2
MCU STOP
ADHWT
Logic
ACFGT
3
Compare true
3
Compare true
ADCCFG
ADCSC1
ADCSC2