147
MC96F6432A
ABOV Semiconductor Co., Ltd.
11.8.6 10-bit Timer 4 PWM Mode
The timer 4 has a high speed PWM (Pulse Width Modulation) function. In PWM mode, the 6-channel pins output up to
10-bit resolution PWM output. This pin should be configured as a PWM output by set PWM4E to
‘1’. When the value of
2-bit +T4CNT and T4PPRH/L are identical in timer 4, a period match signal is generated and the interrupt of timer 4
occurs. In 10-bit PWM mode, A, B, C, bottom(underflow) match signal are generated when the 10-bit counter value
are identical to the value of T4xDRH/L. The period of the PWM output is determined by the T4PPRH/L (PWM period
register), T4xDRH/L (each channel PWM duty register).
PWM Period= [T4PPRH/T4PPRL ] X Source Clock
PWM Duty(A-ch) = [ T4ADRH/T4ADRL ] X Source Clock
Resolution
Frequency
T4CK[3:0]=0001 (250ns)
T4CK[3:0]=0010 (500ns)
T4CK[3:0]=0100 (2us)
10-bit
3.9kHz
1.95kHz
0.49kHz
9-bit
7.8kHz
3.9kHz
0.98kHz
8-bit
15.6kHz
7.8kHz
1.95kHz
7-bit
31.2kHz
15.6kHz
3.91kHz
Table 11.12
PWM Frequency vs. Resolution at 8MHz
The POLxA bit of T4PCR3 register decides the polarity of duty cycle. If the duty value is set same to the period value, the
PWM output is determined by the bit POLxA (1: High, 0: Low). And if the duty value is set to
“00H”, the PWM output is
determined by the bit POLxA (1: Low, 0: High).
PHLT:PxxOE
POLxA
POLBO
POLxB
PWM4xA Pin
Output
PWM4xB Pin
Output
0x, x0, 00
0
0
0
Low-level
Low-level
1
Low-level
High-level
1
x
Low-level
Low-level
1
0
0
High-level
High-level
1
High-level
Low-level
1
x
High-level
High-level
11
0
x
0
Positive-phase
Positive-Phase
1
Positive-phase
Negative-Phase
1
x
0
Negative-Phase
Negative-Phase
1
Negative-Phase
Positive-phase
Table 11.13
PWM Channel Polarity
Содержание MC96F6332A
Страница 16: ...16 MC96F6432A ABOV Semiconductor Co Ltd 4 Package Diagram Figure 4 1 48 Pin QFN Package ...
Страница 17: ...17 MC96F6432A ABOV Semiconductor Co Ltd Figure 4 2 44 Pin MQFP Package ...
Страница 18: ...18 MC96F6432A ABOV Semiconductor Co Ltd Figure 4 3 32 Pin LQFP Package ...
Страница 19: ...19 MC96F6432A ABOV Semiconductor Co Ltd Figure 4 4 32 Pin SOP Package ...
Страница 20: ...20 MC96F6432A ABOV Semiconductor Co Ltd Figure 4 5 28 Pin SOP Package ...