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Analog Power and Ground
Port QB Analog Inputs
External MUX Inputs
Digital Inputs
Port QA Analog Inputs
External Trigger Inputs
External MUX Address Outputs
Digital I/O
27.4.1.2 Port QA Digital Input/Output Signals
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
and low-voltage input (V
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.
27.4.2 Port QB Signal Functions
The four port QB signals can be used as analog inputs or as a 4-bit digital I/O port.
27.4.2.1 Port QB Analog Input Signals
When used as analog inputs, the four port QB signals are referred to as AN[3:0].
MOTOROLA
V
Internal Digital Power
V
V
SSA
V
DDA
V
Analog References
V
AN0/ANW/PQB0
AN1/ANX/PQB1
AN2/ANY/PQB2
AN3/ANZ/PQB3
AN52/MA0/PQA0
AN53/MA1/PQA1
AN55/ETRIG1/PQA3
AN56/ETRIG2/PQA4
Figure 27-2. QADC Input and Output Signals
) requirements.
IL
Chapter 27. Queued Analog-to-Digital Converter (QADC)
SSI
DDI
RH
RL
Analog
Mux and
Port Logic
Signals
Digital
Analog
Results
Converter
and
Control
)
IH
27-5
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