Specifications

CC1101
SWRS061I Page 94 of 98
0x38 (0xF8): PKTSTATUS – Current GDOx Status and Packet Status
Bit
Field Name
Reset
R/W
Description
7
CRC_OK
R
The last CRC comparison matched. Cleared when entering/restarting RX
mode.
6
CS
R
Carrier sense. Cleared when entering IDLE mode.
5
PQT_REACHED
R
Preamble Quality reached. If leaving RX state when this bit is set it will
remain asserted until the chip re-enters RX state (MARCSTATE=0x0D). The
bit will also be cleared if PQI goes below the programmed PQT value.
4
CCA
R
Channel is clear
3
SFD
R
Start of Frame Delimiter. In RX, this bit is asserted when sync word has
been received and de-asserted at the end of the packet. It will also de-
assert when a packet is discarded due to address or maximum length
filtering or the radio enters RXFIFO_OVERFLOW state. In TX this bit will
always read as 0.
2
GDO2
R
Current GDO2 value. Note: the reading gives the non-inverted value
irrespective of what IOCFG2.GDO2_INV is programmed to.
It is not recommended to check for PLL lock by reading PKTSTATUS[2]
with GDO2_CFG=0x0A.
1
R0
Not used
0
GDO0
R
Current GDO0 value. Note: the reading gives the non-inverted value
irrespective of what IOCFG0.GDO0_INV is programmed to.
It is not recommended to check for PLL lock by reading PKTSTATUS[0]
with GDO0_CFG=0x0A.
0x39 (0xF9): VCO_VC_DAC – Current Setting from PLL Calibration Module
Bit
Field Name
Reset
R/W
Description
7:0
VCO_VC_DAC[7:0]
R
Status register for test only.
0x3A (0xFA): TXBYTES – Underflow and Number of Bytes
Bit
Field Name
Reset
R/W
Description
7
TXFIFO_UNDERFLOW
R
6:0
NUM_TXBYTES
R
Number of bytes in TX FIFO
0x3B (0xFB): RXBYTES – Overflow and Number of Bytes
Bit
Field Name
Reset
R/W
Description
7
RXFIFO_OVERFLOW
R
6:0
NUM_RXBYTES
R
Number of bytes in RX FIFO
0x3C (0xFC): RCCTRL1_STATUS – Last RC Oscillator Calibration Result
Bit
Field Name
Reset
R/W
Description
7
R0
Not used
6:0
RCCTRL1_STATUS[6:0]
R
Contains the value from the last run of the RC oscillator calibration routine.
For usage description refer to Application Note AN047 [4]