mc68hc908gp32 Freescale Semiconductor, Inc, mc68hc908gp32 Datasheet - Page 54

• Manufacturer Part Number: mc68hc908gp32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital Converter (ADC)
The V
4.3.3 Conversion Time
Conversion starts after a write to the ADSCR. One conversion will take between 16 and 17 ADC clock
cycles. The ADIVx and ADICLK bits should be set to provide a 1-MHz ADC clock frequency.
54
DDAD
pin should be routed carefully for maximum noise immunity.
INTERNAL
DATA BUS
AIEN
Number of bus cycles = conversion time × bus frequency
INTERRUPT
Connect the V
connect the V
LOGIC
COCO
READ DDRBx
WRITE DDRBx
WRITE PTBx
READ PTBx
BUS CLOCK
CONVERSION
CGMXCLK
COMPLETE
Conversion time =
RESET
SSAD
DDAD
pin to the same voltage potential as the V
ADIV2–ADIV0
pin to the same voltage potential as the V
Figure 4-1. ADC Block Diagram
MC68HC908GP32 Data Sheet, Rev. 10
ADC DATA REGISTER
GENERATOR
DDRBx
PTBx
CLOCK
ADC
16 to 17 ADC cycles
ADC CLOCK
ADICLK
NOTE
ADC frequency
VOLTAGE IN
DISABLE
(V
ADC
ADIN
)
DISABLE
CHANNEL
SELECT
ADC CHANNEL x
PTBx
SS
DD
ADCH4–ADCH0
pin.
pin, and
Freescale Semiconductor