
V PeRiPheRaL MoDuLes 3 (inteRFaCe): i2s inteRFaCe (i2s)
V-4-44
ePson
s1C33L17 teChniCaL ManuaL
Substituting these values in Equation 3 (eq3) yields the MCLKDIV[5:0] values.
32 × 34
————————— = Integer
MCLKDIV[5:0] + 1
MCLKDIV[5:0] = 0, 1, 3, 7, 15, 16, 31, 33, 63
Table V.4.10.5 Master Clock Frequency
MCLKDiV[5:0]
fi2s_MCLK
0
48 MHz
(1088 fs)
1
24 MHz
(544 fs)
3
12 MHz
(272 fs)
7
6 MHz
(136 fs)
15
3 MHz
(68 fs)
16
2.824 MHz
(64 fs)
31
1.5 MHz
(34 fs)
33
1.412 MHz
(32 fs)
63
0.75 MHz
(17 fs)
When using the external master clock (i2s_MCLK_eXt input clock)
The following shows how to determine the clock setting values from the sampling rate and the input master
clock frequency. The example below assumes that the sampling rate of audio data is 44.1 kHz (= fs) and the
master clock frequency is 320 fs.
Master clock frequency = 320
× 44.1 kHz = 14.112 MHz
Find “320 fs” from the table shown below. Either one of the following two settings can be chosen:
1) BCLKDIV[7:0] = 4, WSCLKCYC0[3:0] = 0 (16 cycles)
2) BCLKDIV[7:0] = 3, WSCLKCYC0[3:0] = 4 (20 cycles)
The sample clock (I2S_WS) will be 44.1 kHz.
Table V.4.10.6 External Master Clock Frequency
BCLK
DiV
[7:0]
external master clock frequency (fs: sample clock frequency)
number of bit clock cycles (WsCLKCYC0[3:0] + 16)
16
cycles
17
cycles
18
cycles
19
cycles
20
cycles
21
cycles
22
cycles
23
cycles
24
cycles
25
cycles
26
cycles
27
cycles
28
cycles
29
cycles
30
cycles
31
cycles
0
64 fs
68 fs
72 fs
76 fs
80 fs
84 fs
88 fs
92 fs
96 fs
100 fs
104 fs
108 fs
112 fs
116 fs
120 fs
124 fs
1
128 fs
136 fs
144 fs
152 fs
160 fs
168 fs
176 fs
184 fs
192 fs
200 fs
208 fs
216 fs
224 fs
232 fs
240 fs
248 fs
2
192 fs
204 fs
216 fs
228 fs
240 fs
252 fs
264 fs
276 fs
288 fs
300 fs
312 fs
324 fs
336 fs
348 fs
360 fs
372 fs
3
256 fs
272 fs
288 fs
304 fs
320 fs
336 fs
352 fs
368 fs
384 fs
400 fs
416 fs
432 fs
448 fs
464 fs
480 fs
496 fs
4
320 fs
340 fs
360 fs
380 fs
400 fs
420 fs
440 fs
460 fs
480 fs
500 fs
520 fs
540 fs
560 fs
580 fs
600 fs
620 fs
5
384 fs
408 fs
432 fs
456 fs
480 fs
504 fs
528 fs
552 fs
576 fs
600 fs
624 fs
648 fs
672 fs
696 fs
720 fs
744 fs
6
448 fs
476 fs
504 fs
532 fs
560 fs
588 fs
616 fs
644 fs
672 fs
700 fs
728 fs
756 fs
784 fs
812 fs
840 fs
868 fs
7
512 fs
544 fs
576 fs
608 fs
640 fs
672 fs
704 fs
736 fs
768 fs
800 fs
832 fs
864 fs
896 fs
928 fs
960 fs
992 fs
8
576 fs
612 fs
648 fs
684 fs
720 fs
756 fs
792 fs
828 fs
864 fs
900 fs
936 fs
972 fs 1008 fs 1044 fs 1080 fs 1116 fs
9
640 fs
680 fs
720 fs
760 fs
800 fs
840 fs
880 fs
920 fs
960 fs 1000 fs 1040 fs 1080 fs 1120 fs 1160 fs 1200 fs 1240 fs
10
704 fs
748 fs
792 fs
836 fs
880 fs
924 fs
968 fs 1012 fs 1056 fs 1100 fs 1144 fs 1188 fs 1232 fs 1276 fs 1320 fs 1364 fs
11
768 fs
816 fs
864 fs
912 fs
960 fs 1008 fs 1056 fs 1104 fs 1152 fs 1200 fs 1248 fs 1296 fs 1344 fs 1392 fs 1440 fs 1488 fs
12
832 fs
884 fs
936 fs
988 fs 1040 fs 1092 fs 1144 fs 1196 fs 1248 fs 1300 fs 1352 fs 1404 fs 1456 fs 1508 fs 1560 fs 1612 fs
13
896 fs
952 fs 1008 fs 1064 fs 1120 fs 1176 fs 1232 fs 1288 fs 1344 fs 1400 fs 1456 fs 1512 fs 1568 fs 1624 fs 1680 fs 1736 fs
14
960 fs 1020 fs 1080 fs 1140 fs 1200 fs 1260 fs 1320 fs 1380 fs 1440 fs 1500 fs 1560 fs 1620 fs 1680 fs 1740 fs 1800 fs 1860 fs
15
1024 fs 1088 fs 1152 fs 1216 fs 1280 fs 1344 fs 1408 fs 1472 fs 1536 fs 1600 fs 1664 fs 1728 fs 1792 fs 1856 fs 1920 fs 1984 fs