CC2520_11 Datasheet, PDF (122/133 Pages) Texas Instruments – 2.4 GHZ IEEE 802.15.4/ZIGBEE RF TRANSCEIVER

CC2520 DATASHEET
2.4 GHZ IEEE 802.15.4/ZIGBEE® RF TRANSCEIVER
SWRS068 – DECEMBER 2007
EXTCLOCK, A 0x044, R 0x20, Controls clock output
Bit
Bit mnemonic
no.
7:6
RESERVED
5
EXTCLOCK_EN
4:0
EXT_FREQ
Reset
value
00
1
0x00
Mode
R0
RW
RW
Description
Read as zero
Defines whether the clock generator module for the external clock
is enabled or not. Note that a GPIO pin must be configured as
output and Clock must be selected in one of the GPIOCTRLn
registers to get the clock at the selected pin.
1 - Clock running
0 - Clock off
Frequency setting of external clock. Changes of frequencies are
glitch free and have 50/50 duty cycle. I.e. a change of frequency
will not have effect before a complete period of the current clock
setting is finished.
Setting
Div. factor Frequency [MHz]
00000
32
1,00
00001
31
1,03
00010
30
1,07
00011
29
1,10
00100
28
1,14
00101
27
1,19
00110
26
1,23
00111
25
1,28
01000
24
1,33
01001
23
1,39
01010
22
1,45
01011
21
1,52
01100
20
1,60
01101
19
1,68
01110
18
1,78
01111
17
1,88
10000
16
2,00
10001
15
2,13
10010
14
2,29
10011
13
2,46
10100
12
2,67
10101
11
2,91
10110
10
3,20
10111
9
3,56
11000
8
4,00
11001
7
4,57
11010
6
11011
5
11100
4
11101
3
11110
2
11111
2
5,33
6,40
8,00
10,67
16,00
16,00
122
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