MC68HC11A1 MOTOROLA [Motorola, Inc], MC68HC11A1 Datasheet - Page 41

• Manufacturer Part Number: MC68HC11A1
• Description: 8-Bit Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

10 Analog-to-Digital Converter
MC68HC11A8
MC68HC11A8TS/D
PE0
AN0
PE1
AN1
PE2
AN2
PE6
AN6
PE7
AN7
The A/D converter system uses an all capacitive charge redistribution technique to convert analog sig-
nals to digital values. The MC68HC11A8 A/D system is an 8-channel, 8-bit, multiplexed-input, succes-
sive-approximation converter and is accurate to 1 least significant bit (LSB). It does not require
external sample and hold circuits because of the type of charge redistribution technique used.
Dedicated lines V
block diagram.
A multiplexer allows the single A/D converter to select one of 16 analog signals, as shown in the ADCTL
register description.
PE3
AN3
PE4
AN4
PE5
AN5
ANALOG
ADR1 A/D RESULT 1
MUX
RH
and V
RESULT
RL
Figure 13 A/D Converter Block Diagram
ADR2 A/D RESULT 2
provide the reference supply voltage inputs. Refer to the A/D converter
SUCCESSIVE APPROXIMATION
WITH SAMPLE AND HOLD
REGISTER AND CONTROL
8-BIT CAPACITIVE DAC
RESULT REGISTER INTERFACE
ADR3 A/D RESULT 3
ADCTL A/D CONTROL
ADR4 A/D RESULT 4
V
V
RH
RL
DATA BUS
INTERNAL
MOTOROLA
EA9 A/D BLOCK
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