MC68HC11P2 Datasheet, PDF (174/268 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Analog-to-Digital Converter
9.3 Overview
The A/D system is an 8-channel, 8-bit, multiplexed-input converter. The
VDD AD and VSS AD pins are used to input supply voltage to the A/D
converter. This allows the supply voltage to be bypassed independently.
The converter does not require external sample and hold circuits
because of the type of charge redistribution technique used. A/D
converter timing can be synchronized to the system E clock, or to an
internal resistor capacitor (RC) oscillator. The A/D converter system
consists of four functional blocks: multiplexer, analog converter, digital
control and result storage. Refer to Figure 9-1.
PE0/
AD0
8-bit capacitive DAC
with sample and hold
PE1/
AD1
Successive approximation
PE2/
register and control
AD2
Result
PE3/
AD3
Analog
MUX
PE4/
AD4
PE5/
AD5
PE6/
AD6
PE7/
AD7
VRH
VRL
Internal
data bus
CCF
0
SCAN
MULT
CD
CC
CB
CA
Result register interface
ADR1 - A/D result 1 ADR2 - A/D result 2 ADR3 - A/D result 3 ADR4 - A/D result 4
Technical Data
Analog-to-Digital Converter
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MC68HC11P2 — Rev 1.0