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| 型号： | MC13214R2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, BGA71 |
| 封装： | 9 X 9 MM, 1 MM HEIGHT, ROHS COMPLIANT, LGA-71 |
| 文件页数： | 14/70页 |
| 文件大小： | 802K |
| 代理商： | MC13214R2 |
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MC13211/212/213/214 Technical Data, Rev. 0.0,
Freescale Semiconductor
21
4.6.2.2
SPI Transaction Operation
Although the SPI port of the MCU transfers data in bursts of 8 bits, the 802.15.4 modem requires that a
complete SPI transaction be framed by CE, and there will be three (3) or more bursts per transaction. The
assertion of CE to low signals the start of a transaction. The first SPI burst is a write of an 8-bit header to
the transceiver (MOSI is valid) that defines a 6-bit address of the internal resource being accessed and
identifies the access as being a read or write operation. In this context, a write is data written to the 802.15.4
modem and a read is data written to the SPI master. The following SPI bursts will be either the write data
(MOSI is valid) to the transceiver or read data from the transceiver (MISO is valid).
Although the SPI bus is capable of sending data simultaneously between master and slave, the 802.15.4
modem never uses this mode. The number of data bytes (payload) will be a minimum of 2 bytes and can
extend to a larger number depending on the type of access. After the final SPI burst, CE is negated to high
to signal the end of the transaction.
An example SPI read transaction with a 2-byte payload is shown in Figure 11.
Figure 11. SPI Read Transaction Diagram
4.7
Modem Crystal Oscillator
The modem crystal oscillator uses the following external pins as shown in Figure 12.
1. XTAL1 - reference oscillator input.
2. XTAL2 - reference oscillator output. Note that this pin should not be loaded as a reference source
or to measure frequency; instead use CLKO to measure or supply 16 MHz.
Figure 12. Modem Crystal Oscillator
CE
SPICLK
MISO
MO SI
Valid
Clock Burst
Header
Read data
802.15.4 MODEM
XTAL1
XTAL2
CLKO
MC1321X
27
28
10
16MHz
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| MC1321X | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述: |
| MC1321X_09 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ZigBee?- Compliant Platform - 2.4 GHz Low Power Transceiver for the IEEE? 802.15.4 Standard plus Microcontroller |
| MC13224V | 功能描述:射频收发器 PIP 802.15.4 2.4G IND RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| MC13224V | 制造商:Freescale Semiconductor 功能描述:; Controller Family/Series:(ARM7); Memor |
| MC13224V_09 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Advanced ZigBee?- Compliant Platform-in-Package (PiP) for the 2.4 GHz IEEE? 802.15.4 Standard |
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