M66239FP Datasheet, PDF (13/24 Pages) Renesas Technology Corp – High Speed Standard Clock Generator With Frequency Synthesizer

M66239FP
Function Mode 4 (cont.)
Mode 4 is polygon modulation type as following.
Frequency modulation is set by serial input resister.
(1) Operation mode
(2) Frequency modulation period (Trate)
(3) Frequency modulation start position (Tstart)
(4) Output center frequency (fcenter)
(5) Output peak frequency (fpeak)
(6) 1st.pole position (1stPole)
(7) 2nd.pole position (2ndPole)
(8) 3rd.pole position (3rdPole)
(9) 4th.pole position (4thPole)
(10) 1st.Pole frequency (f1stPole)
(11) 3rd.Pole frequency (f3rdPole)
: Resister 1
: Resister 2
: Resister 3
: Resister 4
: Resister 5
: Resister 6
: Resister 7
: Resister 8
: Resister 9
: Resister 10
: Resister 11
MCLK
TR
CKO
Output
clock
frequency
Fpeak+
F1stpole
Fcenter
F3rdpole
Fpeak–
Tstart
Trate
Tspace1 Tspace2 Tspace3
Tspace4
Tspace5
Modulation start
2nd Pole
1st Pole
3rd Pole
4th Pole
Modulation end
Notes: 1. Each Pole position (cycle number) is defined by Tstart position.
2. Until next TR input, output clock frequency keep "Fcenter".
3. F1stpole and Fpeak+ must set higher frequency than Fcenter.
F3rdpole and Fpeak– must set lower frequency than Fcenter.
Figure 7.2 Operation Timing of Mode 4 (2)
Rev.1.00 Mar 16, 2005 page 13 of 23