PD17012_15 Datasheet, PDF (191/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
Figure 16-5. Relationship Between fr, fN, UP, and DW
(a) If fN is behind fr in phase
fr
fN
UP
DW
(b) If fN leads fr in phase
fr
fN
UP
DW
(c) If fN and fr are in phase
fr
fN
UP
DW
(d) If fN is lower than fr in frequency
fr
fN
UP
DW
16.5.3 Charge pump
As shown in Figure 16-4, the charge pump outputs the up request signal or down request signal from the phase
comparator to the error out (EO) pin.
Therefore, the relationship between the output of the error out pin, divided frequency fN, and reference
frequency fr is as follows.
When reference frequency fr > divided frequency fN: Low-level output
When reference frequency fr < divided frequency fN: High-level output
When reference frequency fr = divided frequency fN: Floating
Data Sheet U10101EJ4V0DS
189