88
MC95FG308 / MC95FG208
ABOV Semiconductor Co., Ltd.
Phase correction & Frequency correction
On operating PWM, it is possible that it is changed the phase and the frequency by using BMOD bit (back-to-back
mode) in T1PCR register. (Figure 11.18, Figure 11.19, Figure 11.20 referred)
In the back-to-back mode, the counter of PWM repeats up/down count. In fact, the effective duty and period becomes
twofold of the register set values. (Figure 11.18, Figure 11.19 referred)
Figure 11.18
Example of PWM Output Waveform
Figure 11.19
Example of PWM waveform in Back-to-Back mode at 4Mhz
T1
00 01 02 03 04
P10/PWM
POLA = 1
T1CR[1:0] = 10
H
(2us)
T1PHR = 00
H
T1PPR = 0B
H
T1ADR = 05
H
09
08
07
06
05
0A
0B
0B
0A
06
07
08
09
02
03
04
05
01
00
00
01
05
04
03
02
07
06
Source Clock
(f
X
)
08
Duty Cycle
(1+05
H
)X2us = 12us
Duty Cycle
(1+05
H
)X2us = 12us
Duty Cycle
(1+05
H
)X2us = 12us
Period Cycle
(1+0B
H
)X2us = 26us
38.46kHz
Start down Counter
Period Cycle
(1+0B
H
)X2us = 26us
38.46kHz
Duty match
detect
Start up Counter
Duty match
detect
T1
Duty
Normal PWM
mode Output
00
H
00
H
00
H
00
H
00
H
MAX
MAX
MAX
MAX
Period
Duty, Period
Update
T1
Duty
Back-to-Back
mode Output
00
H
00
H
00
H
MAX
MAX
MAX
Period
Duty, Period
Update
Duty
Period
Non Back-to-Back
mode
Back-to-Back mode
Содержание MC95FG208 Series
Страница 14: ...14 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd 4 Package Diagram Figure 4 1 32 Pin SOP Package...
Страница 15: ...15 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 2 32 Pin QFN Package...
Страница 16: ...16 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 3 32 Pin LQFP Package...
Страница 17: ...17 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 4 28 Pin SOP Package...
Страница 18: ...18 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 5 28 Pin SOP Package continue...
Страница 19: ...19 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 6 28 Pin SOP Package...
Страница 20: ...20 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 7 28 Pin TSSOP Package...
Страница 21: ...21 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 8 20 Pin SOP Package...
Страница 22: ...22 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 9 20 Pin TSSOP Package...
Страница 23: ...23 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 10 16 Pin SOP Package...
Страница 24: ...24 MC95FG308 MC95FG208 ABOV Semiconductor Co Ltd Figure 4 11 16 Pin TSSOP Package...