MC68HC908LJ24 Datasheet, PDF (336/464 Pages) Motorola, Inc – Microcontrollers

Analog-to-Digital Converter (ADC)
logic and can be used as general-purpose I/O pins. Writes to the port
data register or data direction register will not have any affect on the port
pin that is selected by the ADC. Read of a port pin which is in use by the
ADC will return the pin condition if the corresponding DDR bit is at
logic 0. If the DDR bit is at logic 1, the value in the port data latch is read.
INTERNAL
DATA BUS
READ DDRAx/DDRBx
WRITE DDRAx/DDRBx
RESET
WRITE PTAx/PTBx
DDRAx/DDRBx
PTAx/PTBx
DISABLE
READ PTAx/PTBx
DISABLE
ADC DATA REGISTERS
ADRH ADRL
ADC0–ADC5
(6 CHANNELS)
INTERRUPT
LOGIC
CONVERSION
COMPLETE
ADC
ADC
VOLTAGE IN
(V_ADIN)
CHANNEL
SELECT
PTAx/PTBx
V_LCD
V_REFH
V_REFL
1.2 V
BANDGAP
REFERENCE
AIEN COCO
CGMXCLK
BUS CLOCK
ADC CLOCK
CLOCK
GENERATOR
ADCH[4:0]
ADIV[2:0] ADICLK
Figure 16-2. ADC Block Diagram
Data Sheet
336
Analog-to-Digital Converter (ADC)
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor