CC1000
SWRS048A Page 46 of 55
PRESCALER Register (1Ch)
REGISTER NAME Default
value
Active Description
PRESCALER[7:6] PRE_SWING[1:0] 00 - Prescaler swing. Fractions for
PRE_CURRENT[1:0] = 00
00 : 1 * Nominal Swing
01 : 2/3 * Nominal Swing
10 : 7/3 * Nominal Swing
11 : 5/3 * Nominal Swing
PRESCALER[5:4] PRE_CURRENT
[1:0]
00 - Prescaler current scaling
00 : 1 * Nominal Current
01 : 2/3 * Nominal Current
10 : 1/2 * Nominal Current
11 : 2/5 * Nominal Current
PRESCALER[3] IF_INPUT 0 - 0 : Nominal setting
1 : RSSI/IF pin is input to IF-strips
PRESCALER[2] IF_FRONT 0 - 0 : Nominal setting
1 : Output of IF_Front_amp is switched to
RSSI/IF pin
PRESCALER[1:0] - 00 - Not used
TEST6 Register (for test only, 40h)
REGISTER NAME Default
value
Active Description
TEST6[7] LOOPFILTER_TP1 0 - 1 : Select testpoint 1 to CHP_OUT
0 : CHP_OUT tied to GND
TEST6 [6] LOOPFILTER_TP2 0 - 1 : Select testpoint 2 to CHP_OUT
0 : CHP_OUT tied to GND
TEST6 [5] CHP_OVERRIDE 0 - 1 : use CHP_CO[4:0] value
0 : use calibrated value
TEST6[4:0] CHP_CO[4:0] 10000 - Charge_Pump Current DAC override value
TEST5 Register (for test only, 41h)
REGISTER NAME Default
value
Active Description
TEST5[7:6] - - - Not used
TEST5[5] CHP_DISABLE 0 - 1 : CHP up and down pulses disabled
0 : normal operation
TEST5[4] VCO_OVERRIDE 0 - 1 : use VCO_AO[2:0] value
0 : use calibrated value
TEST5[3:0] VCO_AO[3:0] 1000 - VCO_ARRAY override value
TEST4 Register (for test only, 42h)
REGISTER NAME Default
value
Active Description
TEST4[7:6] - - - Not used
TEST4[5:0] L2KIO[5:0] 100101 h Constant setting charge pump current
scaling/rounding factor. Sets Bandwidth of
PLL. Use 3Fh for 9.6 kBaud and higher
