
MC68336/376
QUEUED ANALOG-TO-DIGITAL CONVERTER MODULE
MOTOROLA
USER’S MANUAL
Rev. 15 Oct 2000
8-3
The QADC allows external trigger inputs and the multiplexer outputs to be combined
onto some of the channel pins. All of the channel pins are used for at least two func-
tions, depending on the modes in use.
The following paragraphs describe QADC pin functions. Figure 8-2 shows the QADC
module pins.
Figure 8-2 QADC Input and Output Signals
8.4.1 Port A Pin Functions
The eight port A pins can be used as analog inputs, or as a bidirectional 8-bit digital
input/output port. Refer to the following paragraphs for more information.
8.4.1.1 Port A Analog Input Pins
When used as analog inputs, the eight port A pins are referred to as AN[59:52]. Due
to the digital output drivers associated with port A, the analog characteristics of port A
QADC PINOUT
AN52/MA0/PQA0
AN53/MA1/PQA1
AN54/MA2/PQA2
AN55/ETRIG1/PQA3
AN56/ETRIG2/PQA4
AN57/PQA5
AN58/PQA6
AN59/PQA7
AN0/ANW/PQB0
AN1/ANX/PQB1
AN2/ANY/PQB2
AN3/ANZ/PQB3
AN48/PQB4
AN49/PQB5
AN50/PQB6
AN51/PQB7
DIGITAL RESULTS
AND CONTROL
ANALOG
CONVERTER
ANALOG
MULTIPLEXER
PORT A ANALOG
INPUTS, EXT TRIGGER
INPUTS, EXT MUX
ADDRESS OUTPUTS,
DIGITAL I/O*
PORT B ANALOG
INPUTS, EXT MUX
INPUTS,
DIGITAL INPUTS
VSS
VDD
VSS
QADC
VDDA
VSSA
VRL
VRH
OUTPUT DRIVER GROUND
ANALOG REFERENCES
ANALOG POWER & GROUND
DIGITAL POWER
(SHARED W/ OTHER MODULES)
PO
R
T
A*
P
O
R
T
B
* PORT A PINS INCORPORATE OPEN DRAIN PULL DOWN DRIVERS.