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MC12311CHN Folha de dados(PDF) 7 Page - Freescale Semiconductor, Inc

Nome de Peças MC12311CHN
Descrição Electrónicos  This section provides a simplified block diagram and highlights MC12311 features
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Fabricante Electrônico  FREESCALE [Freescale Semiconductor, Inc]
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MC12311CHN Folha de dados(HTML) 7 Page - Freescale Semiconductor, Inc

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MC12311 Advance Information, Rev. 1.0
Freescale Semiconductor
7
Operational modes of the MC12311 are determined by the software running on the MCU. The 9S08QE32
itself has its normal run mode as well as two low power modes (Stop2 and Stop3). The MCU in turn sets
the operational mode of the transceiver which include sleep, standby, and radio operational modes.
Two common application scenarios are:
Low power, battery-operated standalone wireless node - a common example of this configuration
would be a remote sensor monitor. The wireless node programmed for standalone operation,
typically has a low active-mode duty cycle, and is designed for long battery life, i.e., lowest power.
Communication channel to a higher level controller - in this example, the wireless node
implements the lower levels of a communications stack and is subordinate to the primary
controller. Typically the MC12311 is connected to the controller through a command channel
implemented via a UART/SCI port or other serial communication port.
4.3
System Clock Configuration
The MC12311 device allows for a wide array of system clock configurations:
Pins are provided for a separate external clock source for the MCU. The external clock source can
by derived from a crystal oscillator or from an external clock source
Pins are provided for a 32 MHz crystal for the transceiver reference clock source (required)
The transceiver can be programmed to provide a ClkOut programmable frequency clock output
that can be used as an external source to the CPU. As a result, a single crystal system clock solution
is possible (see Figure 4).
The MCU provides a trimmable internal reference clock and also supports an external clock
source. An optional onboard frequency locked loop (FLL) can be used with either clock source to
support a CPU clock as high as 50 Mhz at 3.6 V to 2.4 V VDD.
Figure 4. MC12311 Single Crystal System Clock Connection
Sub-1 GHz
Transceiver
CL
CL
32MHz
9S08QE32
MCU
MC12311
XTA
XTB
EXTAL
XTAL
5
6
46
47


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