
Analog-to-Digital Converter (S08ADCV1)
MC9S08SG8 MCU Series Data Sheet, Rev. 8
124
Freescale Semiconductor
Figure 9-2. ADC Block Diagram
9.2
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
Analog Channel inputs
VREFH
High reference voltage
VREFL
Low reference voltage
VDDAD
Analog power supply
VSSAD
Analog ground
AD0
AD27
VREFH
VREFL
ADVIN
ADCH
Control Sequencer
initiali
z
e
sample
co
nv
er
t
tr
an
sf
er
abor
t
Clock
Divide
ADCK
Async
Clock Gen
Bus Clock
ALTCLK
ADICL
K
ADI
V
ADACK
A
DCO
AD
L
S
M
P
ADLP
C
MO
DE
co
m
p
le
te
Data Registers
SAR Converter
Compare Value Registers
Compare
Valu
e
Su
m
AI
EN
CO
C
O
Interrupt
AIEN
COCO
AD
T
R
G
1
2
1
2
MCU STOP
ADHWT
Logic
AC
FG
T
3
Compare true
3
Compare true
ADCCFG
ADCSC1
ADCSC2