Datasheet

Revision 1.5 Page 24 of 41
nRF905 Product Specification
Table 15. Configuration register description
9.5 Register Contents
Table 16. RF config register
Table 17. TX payload register
XOF 3 Crystal oscillator frequency. Must be set according to external
crystal resonant frequency (default = 100).
'000' – 4MHz
'001' – 8MHz
'010' – 12MHz
'011' – 16MHz
'100' – 20MHz
CRC_EN 1 CRC – check enable (default = 1).
'0' – Disable
'1' – Enable
CRC_
MODE
1 CRC – mode (default = 1).
'0' – 8 CRC check bit
'1' – 16 CRC check bit
RF-CONFIG_REGISTER (R/W)
Byte # Content bit[7:0], MSB = bit[7] Init value
0 CH_NO[7:0] 0110_1100
1 bit[7:6] not used, AUTO_RETRAN, RX_RED_PWR,
PA_PWR[1:0], HFREQ_PLL, CH_NO[8]
0000_0000
2 bit[7] not used, TX_AFW[2:0] , bit[3] not used, RX_AFW[2:0] 0100_0100
3 bit[7:6] not used, RX_PW[5:0] 0010_0000
4 bit[7:6] not used, TX_PW[5:0] 0010_0000
5 RX_ADDRESS (device identity) byte 0 E7
6 RX_ADDRESS (device identity) byte 1 E7
7 RX_ADDRESS (device identity) byte 2 E7
8 RX_ADDRESS (device identity) byte 3 E7
9 CRC_MODE,CRC_EN, XOF[2:0], UP_CLK_EN,
UP_CLK_FREQ[1:0]
1110_0111
TX_PAYLOAD (R/W)
Byte # Content bit[7:0], MSB = bit[7] Init value
0 TX_PAYLOAD[7:0] X
1 TX_PAYLOAD[15:8] X
--X
--X
30 TX_PAYLOAD[247:240] X
31 TX_PAYLOAD[255:248] X
Parameter Bitwidth Description