Motorola MCF5282 ユーザーズマニュアル

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Chapter 27.  Queued Analog-to-Digital Converter (QADC)  

27-5

 

Port QA signals are referred to as PQA[4:3, 1:0] when used as a bidirectional 4-bit digital
input/output port. These four signals may be used for general-purpose digital input or
digital output.

Port QA signals are connected to a digital input synchronizer during reads and may be used
as general-purpose digital inputs when the applied voltages meet high-voltage input (V

IH

)

and low-voltage input (V

IL

) requirements. 

Each port QA signal is configured as an input or output by programming the port data
direction register (DDRQA). The digital input signal states are read from the port QA data
register (PORTQA) when DDRQA specifies that the signals are inputs. The digital data in
PORTQA is driven onto the port QA signals when the corresponding bits in DDRQA
specify output. See Section 27.6.4.

The four port QB signals can be used as analog inputs or as a 4-bit digital I/O port.

When used as analog inputs, the four port QB signals are referred to as AN[3:0]. 

AN52/MA0/PQA0
AN53/MA1/PQA1

AN55/ETRIG1/PQA3
AN56/ETRIG2/PQA4

AN0/ANW/PQB0

AN1/ANX/PQB1
AN2/ANY/PQB2

AN3/ANZ/PQB3

Digital

Analog

V

SSI

Analog Power and Ground

Internal Digital Power

PO

R

T

 QB

Converter

Results

and

Control

Analog

Mux and

Port QB Analog Inputs

External MUX Inputs

Digital Inputs

Port QA Analog Inputs

External Trigger Inputs

External MUX Address Outputs

V

DDI

V

SSA

V

DDA

V

RH

V

RL

Analog References

Shared with Other Modules

Digital I/O

Port Logic

POR

T

 QA