參數(shù)資料
型號： QADCRM
英文描述： Queued Analog-to-Digital Converter Reference Manual
中文描述： 排隊模擬到數(shù)字轉(zhuǎn)換器參考手冊
文件頁數(shù)： 18/122頁
文件大?。?/td> 940K
代理商： QADCRM
MOTOROLA
2-2
SIGNAL DESCRIPTIONS
QADC
REFERENCE MANUAL
2.1 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.
2.1.1 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
are different from those of port B. Refer to
more information on analog signal characteristics. All of the analog signal input pins
may be used for at least one other purpose.
APPENDIX B REGISTER SUMMARY
for
2.1.2 Port A Digital Input/Output Pins
Port A pins are referred to as PQA[7:0] when used as a bidirectional 8-bit digital input/
output port. These eight pins may be used for general-purpose digital input signals or
digital open drain pull-down output signals.
Port A pins 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. Refer to
CHARACTERISTICS
for more information on voltage requirements.
APPENDIX A ELECTRICAL
Each port A pin is configured as an input or output by programming the upper half of
the port data direction register (DDRQA). The digital input signal states are read by the
software in the upper half of the port data register when the port data direction register
specifies that the pins are inputs. The digital data in the port data register is driven onto
the port A pins when the corresponding bit in the port data direction register specifies
output. Refer to
APPENDIX B REGISTER SUMMARY
outputs are open drain drivers (so as to minimize the effects to the analog function of
the pins), active external pull-up provisions must be made when the output is used to
drive another integrated circuit.
for more information. Since the
2.2 Port B Pin Functions
The eight port B pins can be used as analog inputs, or as an 8-bit digital input only port.
Refer to the following paragraphs for more information.
2.2.1 Port B Analog Input Pins
When used as analog inputs, the eight port B pins are referred to as AN[51:48]/
AN[3:0]. Since port B functions as analog and digital input only, the analog character-
istics are different from those of port A. Refer to
ACTERISTICS
for more information on analog signal characteristics. All of the analog
signal input pins may be used for at least one other purpose.
APPENDIX A ELECTRICAL CHAR-
2.2.2 Port B Digital Input Pins
Port B pins are referred to as PQB[7:0] when used as an 8-bit digital input only port.
In addition to functioning as analog input pins, the port B pins are also connected to
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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