MRF24J40_08 Datasheet, PDF (14/152 Pages) Microchip Technology – IEEE 802.15.4™ 2.4 GHz RF Transceiver

MRF24J40
2.14.1 SHORT ADDRESS REGISTER
INTERFACE
The short address memory space contains control
registers with a 6-bit address range of 0x00 to 0x3F.
Figure 2-7 shows a short address read and Figure 2-8
shows a short address write. The 8-bit SPI transfer
FIGURE 2-7:
SHORT ADDRESS READ
begins with a ‘0’ to indicate a short address transaction.
It is followed by the 6-bit register address, Most Signif-
icant bit (MSb) first. The 8^th bit indicates if it is a read
(‘0’) or write (‘1’) transaction.
CS
SCK
SDI 0
A5 A4 A3 A2 A1 A0
0
X
SDO
D7 D6 D5 D4 D3 D2 D1 D0
FIGURE 2-8:
SHORT ADDRESS WRITE
CS
SCK
SDI 0
A5 A4 A3 A2 A1 A0
1
D7 D6 D5 D4 D3 D2 D1 D0
SDO
DS39776B-page 12
Preliminary
© 2008 Microchip Technology Inc.