Si570/Si571
Register 12. Reference Frequency
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
Type
RFREQ[7:0]
R/W
Bit
7:0
Name
RFREQ[7:0]
Reference Frequency.
Function
Frequency control input to DCO.
Register 13. High Speed/N1 Dividers
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
Type
Bit
7:5
HS_DIV_7PPM[2:0]
R/W
Name
HS_DIV_7PPM[2:0] DCO High Speed Divider.
N1_7PPM[6:2]
R/W
Function
Sets value for high speed divider that takes the DCO output f OSC as its clock input.
000 = 4
001 = 5
010 = 6
011 = 7
100 = Not used.
101 = 9
110 = Not used.
111 = 11
4:0
N1_7PPM[6:2]
CLKOUT Output Divider.
Sets value for CLKOUT output divider. Allowed values are [1] and [2, 4, 6, ..., 2 7 ]. Ille-
gal odd divider values will be rounded up to the nearest even value. The value for the
N1 register can be calculated by taking the divider ratio minus one. For example, to
divide by 10, write 0001001 (9 decimal) to the N1 registers.
0000000 = 1
1111111 = 2 7
Rev. 1.4
21
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