RF60 Datasheet, PDF (49/157 Pages) –

RF60 CRYSTAL-LESS SOC TRANSMITTER v1.0
SFR Definition 12.2. ODS_TIMING
Bit
Name
Type
Reset
7
6
5
ODS_GROUP_WIDTH[2:0]
R/W
R/W
R/W
0
0
0
4
3
ODS_EDGE_TIME
[1:0]
R/W
R/W
0
0
2
1
0
ODS_CK_DIV[2:0]
R/W
R/W
R/W
0
0
0
SFR Address = 0xAA
Bit Name
Function
7:5 ODS_ Controls symbol group width, from 2-8 symbols
GROUP_ Set to 4 to transmit 5 symbol groups obtained from 4/5 encoding. Or set to 7 to sam-
WIDTH[2:0] ^{ple 8 symbol group obtained from Manchester encoding of 4 bits. Note that}
ser_group_width can be changed dynamically prior to writing the ODS_DATA regis-
ter, should you want to (for example) add 2 more symbols to the end of a
transmission which was previously using 8 symbol groups.
4:3 ODS_ Controls PA Edge Time
EDGE_ Additional division factor in range 1-4 (ser_edgetime+1). PA controlled edge rates
TIME
[1:0]
are: 8*(ods_ck_div+1)*(ser_edgetime+1)/25 MHz. When clk_ods is in range of 3-
8 MHz, edge rate can be selected from 1us to 10.7us. Study has indicated that in the
worst case (20Kbps Manchester), edge rates somewhat higher than 4us are needed.
2:0 ODS_CK_ Controls the clock of the ODS
DIV[2:0] Control first 24Hz clock divider to produce slower clk_ods.
Division factors are 1-8 (ods_ck_div+1). Generally should select factor which
produces serializer clock in range of ~ 3-8 MHz
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