mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 542

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

Queued Analog-to-Digital Converter (QADC)
28.4.1.1 Port QA Analog Input Signals
When used as analog inputs, the four port QA signals are referred to as AN[56:55, 53:52].
28.4.1.2 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
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
Direction Register (DDRQA &
28.4.2
The four port QB signals can be used as analog inputs or as a 4-bit digital I/O port.
28.4.2.1 Port QB Analog Input Signals
When used as analog inputs, the four port QB signals are referred to as AN[3:0].
28-4
IL
External MUX Address Outputs
) requirements.
Port QB Signal Functions
Port QB Analog Inputs
External Trigger Inputs
Port QA Analog Inputs
External MUX Inputs
Digital Inputs
Digital I/O
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
Shared with Other Modules
Analog Power and Ground
Internal Digital Power
Analog References
Figure 28-2. QADC Input and Output Signals
DDRQB).
AN55/ETRIG1/PQA3
AN56/ETRIG2/PQA4
AN52/MA0/PQA0
AN53/MA1/PQA1
AN0/ANW/PQB0
AN1/ANX/PQB1
AN2/ANY/PQB2
AN3/ANZ/PQB3
V
V
V
V
V
DDA
V
SSA
DDI
SSI
RH
RL
Port Logic
Mux and
Analog
Section 28.6.4, “Port QA and QB Data
Converter
Analog
Freescale Semiconductor
IH
) and low-voltage
Results
Control
Digital
and