upd17072 Renesas Electronics Corporation., upd17072 Datasheet - Page 133
upd17072
Manufacturer Part Number
upd17072
Description
4-bit Single-chip Microcontroller With Hardware For Digital Tuning System
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD17072.pdf
(226 pages)
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15.3 Reference Frequency Generator
frequency “f
Figure 15-6 shows the configuration of the reference frequency generator.
The reference frequency generator divides 75 kHz output by the crystal oscillator to generate the reference
As reference frequency f
Reference frequency f
Figure 15-7 shows the configuration and functions of the PLL reference frequency select register.
75 kHz
r
” of the PLL frequency synthesizer.
Figure 15-6. Configuration of Reference Frequency Generator
r
is selected by the PLL reference frequency select register.
r
, six frequencies can be selected: 1, 3, 5, 6.25, 12.5, and 25.
Divider
6.25 kHz
12.5 kHz
25 kHz
1 kHz
3 kHz
5 kHz
MUX
PLLRFCK2 flag
PLLRFCK1 flag
PLLRFCK0 flag
OFF
To -DET
PLL disable signal
PD17072,17073
133
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