186
MC97F60128
ABOV Semiconductor Co., Ltd.
Update period & duty register value at once
The period and duty of PWM comes to move from temporary registers to T8PPRH/L (PWM Period Register) and
T8ADRH/L,T8BDRH/L,T8CDRH/L (PWM Duty Register) when always period match occurs. If you want that the period
and duty is immediately changed, the UPDT bit in the T8PCR1
register must set to ‘1’. It should be noted that it needs
the 3 cycle of timer clock for data transfer in the internal clock synchronization circuit. So the update data is written
before 3 cycle of timer clock to get the right output waveform.
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 T8PCR1 register. (Figure 11.31, Figure 11.32, Figure 11.33 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 11.32, Figure 11.33 referred)
Figure 11.31
Example of PWM Output Waveform
T8CNT
Duty
Normal PWM mode
Output
00
H
00
H
00
H
00
H
00
H
MAX
MAX
MAX
MAX
Period
Duty, Period
Update
T8CNT
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
Summary of Contents for MC97F60128
Page 17: ...17 MC97F60128 ABOV Semiconductor Co Ltd 4 Package Diagram Figure 4 1 100 pin LQFP 1414 Package...
Page 18: ...18 MC97F60128 ABOV Semiconductor Co Ltd Figure 4 2 80 Pin LQFP 1212 Package...
Page 19: ...19 MC97F60128 ABOV Semiconductor Co Ltd Figure 4 3 80 Pin LQFP 1414 Package...
Page 20: ...20 MC97F60128 ABOV Semiconductor Co Ltd Figure 4 4 64 Pin LQFP 1414 Package...