- 您现在的位置：买卖IC网 > Sheet目录395 > AT86RF231-ZFR (Atmel)TXRX LOW POWER 2.4GHZ 32VQFN
AT86RF231
11.7
11.7.1
Frame Buffer Empty Indicator
Overview
For time critical applications that want to start reading the frame data as early as possible, the
Frame Buffer status can be indicated to the microcontroller through a dedicated pin. This pin
indicates to the microcontroller if an access to the Frame Buffer is not possible since valid PSDU
data are missing.
Pin 24 (IRQ) can be configured as a Frame Buffer Empty Indicator during a Frame Buffer read
access. This mode is enabled by register bit RX_BL_CTRL (register 0x04, TRX_CTRL_1). The
IRQ pin turns into Frame Buffer Empty Indicator after the Frame Buffer read access command,
see note (1) in Figure 11-13 on page 152 , has been transferred on the SPI bus until the Frame
Buffer read procedure has finished indicated by /SEL = H, see note (4) .
Figure 11-13. Timing Diagram of Frame Buffer Empty Indicator
/SEL
SCLK
MOSI
Command
XX
Command
XX
XX
XX
XX
XX
Command
XX
MISO
PHY_STATUS IRQ_STATUS
PHY_STATUS
PHR[7:0]
PSDU[7:0]
PSDU[7:0]
PSDU[7:0]
LQI[7:0]
PHY_STATUS IRQ_STATUS
IRQ
IRQ_2 (RX_START)
Frame Buffer Empty Indicator
IRQ_3 (TRX_END)
t 13
Notes
(1)
(2)
(3)
(4)
The microcontroller has to observe the IRQ pin during the Frame Buffer read procedure. A
Frame Buffer read access can proceed as long as pin IRQ = L, see note (2) . Pin IRQ = H indi-
cates that the Frame Buffer is currently not ready for another SPI cycle, note (3), and thus the
Frame Buffer read procedure has to wait for valid data accordingly.
The access indicator pin 24 (IRQ) shows a valid access signal (either access is allowed or
denied) not before t 13 = 750 nsec after the rising edge of last SCLK clock of the Frame Buffer
read command byte.
After finishing the SPI frame receive procedure, and the SPI has been released by /SEL = H,
note (4) , pending interrupts are indicated immediately by pin IRQ. During all other SPI accesses,
except during a SPI frame receive procedure with RX_BL_CTRL = 1, pin IRQ only indicates
interrupts.
If a receive error occurs during the Frame Buffer read access the Frame Buffer Empty Indicator
locks on 'empty' (pin IRQ = H) too. To prevent possible deadlocks, the microcontroller should
impose a timeout counter that checks whether the Frame Buffer Empty Indicator remains logic
high for more than 64 μs. Presuming a PHY data rate of 250 kb/s a new byte must have been
arrived at the Frame Buffer during that period. If not, the Frame Buffer read access should be
aborted.
152
8111C–MCU Wireless–09/09
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
AT86RF232-ZX
2.4 GHZ ZIGBEE TRANSCEIVER
AT88CK201BK
BRD CRYPTORF READER AT88RF1354
AT88SC-ADK2
KIT ARIS+ DK CRYPTOMEM/COMPANION
AT88SC3216CRF-MY1
IC EEPROM 32KBIT 13MHZ TAG
ATA-2001
LVDT AMPLIFIER
ATAB5429-9-B
BOARD BASESTATN UHF RCVR 915MHZ
ATAB5749-3
BOARD XMITTER FOR 315MHZ ATA5749
ATAKSTK511-3
KIT RF MODULE 315MHZ FOR STK500
相关代理商/技术参数
AT86RF231-ZU
功能描述:射频收发器 2.4GHz Zigbee Transceiver
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
AT86RF231-ZU_09
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Low Power 2.4 GHz Transceiver for ZigBee
AT86RF231-ZUR
功能描述:射频收发器 2.4GHz, Zigbee Transceiver
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
AT86RF232-ZX
功能描述:射频收发器 2.4 GHZ ZIGBEE TRANSCEIVER
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
AT86RF232-ZXR
功能描述:射频收发器 2.4 GHZ ZIGBEE TRANSCEIVER
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
AT86RF233-ZF
功能描述:IC RF TXRX+MCU 802.15.4 32-VFQFN 制造商:microchip technology 系列:- 包装:托盘 零件状态:在售 类型:TxRx + MCU 射频系列/标准:802.15.4，通用 ISM > 1GHz 协议:6LoWPAN，Zigbee? 调制:O-QPSK 频率:2.4GHz 数据速率（最大值）:2Mbps 功率 - 输出:4dBm 灵敏度:-101dBm 存储容量:128B SRAM 串行接口:SPI 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:11.3mA ~ 11.8mA 电流 - 传输:7.2mA ~ 13.8mA 工作温度:-40°C ~ 125°C 封装/外壳:32-VFQFN 裸露焊盘 标准包装:490
AT86RF233-ZFR
功能描述:IC RF TXRX+MCU 802.15.4 32-VFQFN 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:在售 类型:TxRx + MCU 射频系列/标准:802.15.4，通用 ISM > 1GHz 协议:6LoWPAN，Zigbee? 调制:O-QPSK 频率:2.4GHz 数据速率（最大值）:2Mbps 功率 - 输出:4dBm 灵敏度:-101dBm 存储容量:128B SRAM 串行接口:SPI 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:11.3mA ~ 11.8mA 电流 - 传输:7.2mA ~ 13.8mA 工作温度:-40°C ~ 125°C 封装/外壳:32-VFQFN 裸露焊盘 标准包装:1
AT86RF233-ZU
功能描述:射频收发器 2.4GHz ZigBee Transceiver
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