MC68HC711E20CFN2 Freescale Semiconductor, MC68HC711E20CFN2 Datasheet - Page 210

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MC68HC711E20CFN2

Manufacturer Part Number
MC68HC711E20CFN2
Description
IC MCU 20K 2MHZ OTP 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC11r
Datasheets

Specifications of MC68HC711E20CFN2

Core Processor
HC11
Core Size
8-Bit
Speed
2MHz
Connectivity
SCI, SPI
Peripherals
POR, WDT
Number Of I /o
38
Program Memory Size
20KB (20K x 8)
Program Memory Type
OTP
Eeprom Size
512 x 8
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
52-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Analog-to-Digital (A/D) Converter
10.3 Overview
10.3.1 Multiplexer
Technical Data
210
The A/D system is an 8-channel, 8-bit, multiplexed-input converter. 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
The multiplexer selects one of 16 inputs for conversion. Input selection
is controlled by the value of bits CD:CA in the ADCTL register. The eight
port E pins are fixed-direction analog inputs to the multiplexer, and
additional internal analog signal lines are routed to it.
Port E pins also can be used as digital inputs. Digital reads of port E pins
are not recommended during the sample portion of an A/D conversion
cycle, when the gate signal to the N-channel input gate is on. Because
no P-channel devices are directly connected to either input pins or
reference voltage pins, voltages above V
problem, although current should be limited according to maximum
ratings. Refer to
pin.
10-1.
Analog-to-Digital (A/D) Converter
Figure
10-2, which is a functional diagram of an input
DD
do not cause a latchup
M68HC11E Family — Rev. 3.2
MOTOROLA

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