mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 260
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mc68hc908jb16
Manufacturer Part Number
mc68hc908jb16
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908JB16.pdf
(332 pages)
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Clock Generator Module (CGM)
13.9.6 Phase Detector Control Register (PDCR)
13.10 Pre-Defined VCO Output Frequency Settings
Technical Data
260
Frequency
Channel
(MHz)
26.54
26.59
26.64
26.69
26.74
Frequency
Crystal
(MHz)
12
12
12
12
12
Table 13-1. Predefined Programming Setting for PLL
Address:
Reset:
The phase detector control register configures the phase detector for
both PLLs.
PHD_[7:0] — Phase detector Control Bits for both PLLs
The exact frequency values for the following required channels cannot
be synthesized by using a reference frequency higher than 10kHz. An
absolute offset frequency from +1.66kHz to +1.89kHz will be introduced
for different channels and the maximum relative offset is only ±115Hz
with 1.775kHz as the center point (see
Programming Setting for
further minimized by reducing the crystal frequency by 60 ppm (360Hz)
in actual application.
Read:
Write:
Set PHD_[7:0] = $70 for maximum performance.
Figure 13-14. Phase Detector Control Register (PDCR)
Divider R
PHD_7
$0059
Bit 7
1
288
338
268
370
302
Clock Generator Module (CGM)
PHD_6
6
0
Frequency
Reference
41.67
35.50
44.78
32.43
39.74
(kHz)
PHD_5
5
0
PLL). The absolute offset frequency can be
PHD_4
Divider N
4
1
637
749
595
823
673
Table 13-1 . Predefined
PHD_3
3
0
Frequency
MC68HC908JB16
26.54166
26.59171
26.64179
26.69189
26.74172
PHD_2
(MHz)
VCO
Freescale Semiconductor
2
0
PHD_1
1
0
Absolute
Offset
+1.66
+1.71
+1.79
+1.89
+1.72
(kHz)
—
Rev. 1.1
PHD_0
Bit 0
0
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