參數(shù)資料
型號: MRF24J40-IMM
廠商: Microchip Technology Inc.
英文描述: IEEE 802.15.4⑩ 2.4 GHz RF Transceiver
中文描述: IEEE 802.15.4標(biāo)準(zhǔn)⑩2.4 GHz射頻收發(fā)器
文件頁數(shù): 19/66頁
文件大?。?/td> 748K
代理商: MRF24J40-IMM
2006 Microchip Technology Inc.
Advance Information
DS39776A-page 17
MRF24J40
4.3.2
WRITING LONG ADDRESS
REGISTERS
The long address space is accessed by sending a ‘
1
as the first bit of the SPI transfer. The following 10 bits
are the address of the target register. The final bit is a
1
‘ to indicate that the command is a write. On the next
clock edge of SCK, the Most Significant bit of the
register will shift out, followed by the rest of the bits.
4.4
Buffer Interface
The receive and transmit buffers in the MRF24J40 are
located in the long RAM address space. These buffers
are accessed using the same process as accessing the
long RAM control addresses. The received buffer is
read-only and should not be written to. The use of these
buffers is described in
Section 7.0 “Transmitting and
Receiving Packets”
.
FIGURE 4-6:
LONG ADDRESS WRITE
EXAMPLE 4-4:
LONG ADDRESS WRITE EXAMPLE
SCK
SDI
SDO
CS
A9
A8
A7
A6
A5
D7
D6
D5
D4
D3
D2
D1
D0
X
A4
A3
A2
A1
A0
1
X
1
void SetLongRAMAddress(WORD address, BYTE value)
{
CSn = 0;
SPIPut((((BYTE)(address>>3))&0b01111111)|0x80);
SPIPut((((BYTE)(address<<5))&0b11100000)|0x10);
SPIPut(value);
CSn = 1;
}
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