Chapter 9 Analog-to-Digital Converter (S08ADC10V1)
Compare true
ADCSC1
3
ADCCFG
Async
Clock Gen
1
2
ADACK
Bus Clock
ALTCLK
MCU STOP
ADHWT
ADCK
Clock
Divide
Control Sequencer
÷2
AD0
1
2
AIEN
Interrupt
COCO
ADVIN
SAR Converter
AD27
V
V
REFH
Data Registers
REFL
Compare true
ADCSC2
3
Compare
Logic
Compare Value Registers
Figure 9-2. ADC Block Diagram
9.3
External Signal Description
The ADC module supports up to 28 separate analog inputs. It also requires four supply/reference/ground
connections.
Table 9-2. Signal Properties
Name
Function
AD27–AD0
VREFH
Analog Channel inputs
High reference voltage
Low reference voltage
Analog power supply
Analog ground
VREFL
VDDAD
VSSAD
MC9S08AC60 Series Data Sheet, Rev. 2
140
Freescale Semiconductor
FREESCALE [ Freescale ]
