M66239FP datasheet(13/24 Pages) RENESAS

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M66239FP

Rev.1.00 Mar 16, 2005 page 13 of 23

Function Mode 4 (cont.)

Mode 4 is polygon modulation type as following.

Frequency modulation is set by serial input resister.

(1) Operation mode

: Resister 1

(2) Frequency modulation period (Trate)

: Resister 2

(3) Frequency modulation start position (Tstart)

: Resister 3

(4) Output center frequency (fcenter)

: Resister 4

(5) Output peak frequency (fpeak)

: Resister 5

(6) 1st.pole position (1stPole)

: Resister 6

(7) 2nd.pole position (2ndPole)

: Resister 7

(8) 3rd.pole position (3rdPole)

: Resister 8

(9) 4th.pole position (4thPole)

: Resister 9

(10) 1st.Pole frequency (f1stPole)

: Resister 10

(11) 3rd.Pole frequency (f3rdPole)

: Resister 11

Tstart

2nd Pole

1st Pole

MCLK

CKO

Fpeak+

Fpeak–

Fcenter

F1stpole

F3rdpole

4th Pole

3rd Pole

Trate

Tspace1

Tspace3

Tspace4

Tspace2

Tspace5

Notes: 1.

Each Pole position (cycle number) is defined by Tstart position.

Until next TR input, output clock frequency keep "Fcenter".

F1stpole and Fpeak+ must set higher frequency than Fcenter.

F3rdpole and Fpeak– must set lower frequency than Fcenter.

Output

clock

frequency

Modulation start

Modulation end

Figure 7.2 Operation Timing of Mode 4 (2)

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