ROHS MC9S08QE128 - External Signal Description

12-bit Analog-to-Digital Converter (S08ADCV1)
MC9S08QE128 MCU Series Reference Manual, Rev. 2
180 Freescale Semiconductor
Figure 10-2. ADC Block Diagram
10.2 External Signal Description
The ADC module supports up to 28 separate analog inputs. It also requires four supply/reference/ground
connections.
Table 10-2. 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
Interru
pt
AIEN
COCO
ADTRG
1
2
1 2
M
CU STOP
ADHWT
Logic
ACFGT
3
Compare true
3
Compare true
ADCCFG
ADCSC1
ADCSC2