mrf24j40 Microchip Technology Inc., mrf24j40 Datasheet - Page 17

• Manufacturer Part Number: mrf24j40
• Description: Ieee 802.15.4? 2.4 Ghz Rf Transceiver
• Manufacturer: Microchip Technology Inc.

4.2.2
The short address space is accessed by sending a ‘0’
as the first bit of the SPI transfer. The following 6 bits
are the address of the target register. The final bit of the
first byte 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.
FIGURE 4-4:
EXAMPLE 4-2:
© 2006 Microchip Technology Inc.
SDO
SCK
SDI
CS
void SetShortRAMAddress(BYTE address, BYTE value)
{
}
0
WRITING SHORT ADDRESS
REGISTERS
CSn = 0;
SPIPut(((address<<1)&0b01111111)|0x01);
SPIPut(value);
CSn = 1;
A5
A4
SHORT ADDRESS WRITE
SHORT ADDRESS WRITE EXAMPLE
A3
A2
A1
Advance Information
A0
1
D7
D6
D5
D4
X
D3
MRF24J40
D2
D1
DS39776A-page 15
D0