mc68hc908ap8cfa Freescale Semiconductor, Inc, mc68hc908ap8cfa Datasheet - Page 251

• Manufacturer Part Number: mc68hc908ap8cfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

15.3.3 Conversion Time
Conversion starts after a write to the ADSCR. One conversion will take between 16 and 17 ADC clock
cycles, therefore:
Freescale Semiconductor
AIEN
INTERRUPT
INTERNAL
DATA BUS
LOGIC
Number of bus cycles = conversion time × bus frequency
COCO
Conversion time =
READ DDRAx
WRITE DDRAx
WRITE PTAx
READ PTAx
CONVERSION
COMPLETE
BUS CLOCK
CGMXCLK
RESET
MC68HC908AP Family Data Sheet, Rev. 4
Figure 15-2. ADC Block Diagram
ADC DATA REGISTERS
16 to17 ADC cycles
ADIV[2:0]
ADRH0
ADC frequency
GENERATOR
10-BIT ADC
DDRAx
PTAx
CLOCK
ADRL0
ADRL1
ADRL2
ADRL3
ADCICLK
ADICLK
VOLTAGE IN
DISABLE
(V
ADC
ADIN
)
2-BIT UP-COUNTER
DISABLE
CHANNEL
ADC0–ADC7
(8 CHANNELS)
SELECT
MUX
ADCH[4:0]
Functional Description
AUTO[1:0]
ASCAN
PTAx/ADCx
VREFH
VREFL
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