Texas Instruments 3138 155 232931 Syncword 0x14 Sync Word, Txctrl 0x15 Transmit Control Register

				CC2420
SYNCWORD (0x14) - Sync Word
Bit	Field Name	Reset	R/W	Description
15:0	SYNCWORD[15:0]	0xA70F	R/W	Synchronisation word. The SYNCWORD is processed from the
				least significant nibble (F at reset) to the most significant nibble
				(A at reset).
				SYNCWORD is used both during modulation (where 0xF’s are
				replaced with 0x0’s) and during demodulation (where 0xF’s are
				not required for frame synchronisation). In reception an implicit
				zero is required before the first symbol required by SYNCWORD.
				The reset value is compliant with IEEE 802.15.4.

TXCTRL (0x15) - Transmit Control Register

Bit	Field Name	Reset	R/W
15:14	TXMIXBUF_CUR[1:0]	2	R/W

13	TX_TURNAROUND	1	R/W
12:11	TXMIX_CAP_ARRAY[1:0]	0	R/W
10:9	TXMIX_CURRENT[1:0]	0	R/W

8:6 PA_CURRENT[2:0] 3 R/W

5	-	1	W1
4:0	PA_LEVEL[4:0]	31	R/W

Description

TX mixer buffer bias current.

0:690uA

1:980uA

2:1.16mA (nominal)

3:1.44mA

Sets the wait time after STXON before transmission is started.

0 : 8 symbol periods (128 us)

1 : 12 symbol periods (192 us)

Selects varactor array settings in the transmit mixers.

Transmit mixers current:

0:1.72 mA

1:1.88 mA

2:2.05 mA

3:2.21 mA

Current programming of the PA

0:-3 current adjustment

1:-2 current adjustment

2:-1 current adjustment

3:Nominal setting

4:+1 current adjustment

5:+2 current adjustment

6:+3 current adjustment

7:+4 current adjustment

Reserved, write as 1.

Output PA level. (~0 dBm)

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