IC213 Datasheet, PDF (9/11 Pages) IC-Haus GmbH – PROGRAMMABLE OSCILLATOR MODULE

iC213
preliminary
PROGRAMMABLE OSCILLATOR MODULE
Rev A1, Page 9/11
Frequency number
Registers 16 and 17 hold the 12 bit value of the set
frequency number from Figure 3. Using this register
the frequency number can be set or the current fre-
quncy number can be read. If the programmed fre-
quency number is not one of the listed ones, 0xFFFF
is returned.
Register / Addr. Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Beschreibung
16 0x10
17 0x11
FREQ_NR[7:0]
0000
FREQ_NR[11:8]
Frequency number
Table 8: Register for 12 bit frequency number
Oscillator calibration bytes
The six registers of the Oscillator Calibration Bytes
represent the settings of the intrinsic oscillator. Setting
these registers via I²C directly manipulates the settings
of the oscillator device. The output frequency of the
module however also depends on the settings of the
divider (register 24).
The following table shows the register assembly:
Register / Addr.
18 0x12
19 0x13
20 0x14
21 0x15
22 0x16
23 0x17
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
HS_DIV[2:0]
N1[6:2]
N1[1:0]
RFREQ[37:32]
RFREQ[31:24]
RFREQ[23:16]
RFREQ[15:8]
RFREQ[7:0]
Bit 0
Description
Table 9: Oscillator Calibration Bytes register
HS_DIV[2:0] - High-speed divider
Using this 3 bit the first frequency divider following the
DCO is set.
N1[6:0] - Output divider
These 7 bit set the output divider. N1 must hold only
even values betwee 1 and 128, e.g. 2, 4, 6, etc. up
to 128. The only exception is the division factor of 1.
Invalid valued are rounded up to the next even value.
ET[1:0] - External divider
ET[1:0]
00 / 01
10
11
Teiler
1
64
256
Table 10: Truth table for the external divider
VER_D[37:0] - RFREQ
RFREQ contains the multiplier for the DCO. The upper
10 bit contain the digits to the left of the decimal point
and the lower 28 bit the digits to the right of the decimal
point.
External divider
Using this register the external clock divider of the
iC213 module is set. The divider can be set to 1/1,
1/64 or 1/256.
Register / Addr. Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Description
24 0x18
0
0
0
0
0
0
ET[1:0] external divider
Table 11: Register for the external divider