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參數(shù)資料
| 型號： | ADCRM |
| 英文描述： | Analog-to-Digital Reference Manual |
| 中文描述： | 模擬到數(shù)字參考手冊 |
| 文件頁數(shù)： | 13/46頁 |
| 文件大小： | 415K |
| 代理商： | ADCRM |
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ADC
REFERENCE MANUAL
SIGNAL DESCRIPTIONS
MOTOROLA
2-1
SECTION 2 SIGNAL DESCRIPTIONS
The ADC uses up to 20 pins. Up to eight pins are analog inputs (which can also be
used as digital inputs), two pins are analog reference connections, and two pins are
analog supply connections. In addition, eight pins serve as digital output pins in certain
microcontroller systems. In systems not requiring these pins, they are not implement-
ed, and the outputs from the module are not connected. Refer to the appropriate mi-
crocontroller user's manual for specific information.
2.1 Analog/Digital Input Pins (AN[7:0]/PADA[7:0])
Each of the eight analog input pins (AN[7:0]) is connected to a multiplexer in the ADC.
The multiplexer selects an analog input to convert to digital data. Input voltages to the
multiplexer must be between V
RH
and V
RL
CONSIDERATIONS
for recommendations on filtering the analog inputs.
. Refer to
SECTION 6 PIN CONNECTION
The analog input pins can also be read as digital inputs, provided the applied voltage
is within the limits specified in
APPENDIX A ELECTRICAL CHARACTERISTICS
.
When used as digital inputs, the pins are organized into an 8-bit port, port ADA. Data
for port A is latched in the lower half of the 16-bit port data register (PDR). The digital
inputs are then referred to as PADA[7:0]. When used for digital input, each of these
pins is conditioned by a synchronizer with an enable feature. The synchronizer is not
enabled until the actual IMB bus cycle addressing the PDR begins. This minimizes the
high-current effect of mid-level signals on the inputs. This is particularly important
when some of the inputs are being used as digital inputs and some as analog inputs.
Refer to
3.3 General-Purpose I/O
for more information on port ADA.
2.2 Digital Output Pins (PADB[7:0])
The eight digital output pins (PADB[7:0]) make up port ADB, an output-only port. Data
for port ADB is latched in the upper half of the PDR. On some MCUs, these pins are
left unconnected and port ADB is not implemented.
A read of the upper byte of the port data register returns the digital value in the output
register of port ADB. Refer to
3.3 General-Purpose I/O
output port.
for more information on this
2.3 Analog Reference Pins
Separate high (V
analog reference pins. Because they are separated from the analog power supply pins
(V
DDA
and V
SSA
), the reference pins can be connected to regulated and filtered sup-
plies that allow the ADC to achieve its highest degree of accuracy. Refer to
6 PIN CONNECTION CONSIDERATIONS
ditioning the analog reference inputs.
RH
) and low (V
RL
) analog reference voltages are connected to the
SECTION
for recommendations on filtering and con-
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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