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型号： XE8000EV104
厂商： Semtech
文件页数： 55/156页
文件大小： 0K
描述： EVAL BOARD FOR XE8805AMI028LF
标准包装： 1
类型： MCU
适用于相关产品： XE88LC05AMI028
所含物品： 完全组装的评估板
Semtech 2006
www.semtech.com
20-8
XE8805/05A
20.10 PWM mode
The counters can generate PWM signals (Pulse Width Modulation) on the Port B outputs PB(0) and PB(1).
The PWM mode is selected by setting CntPWM1 and CntPWM0 in the RegCntConfig1 register. See Table 20-11
and Table 20-12 for an exact description of how the setting of CntPWM1 and CntPWM0 affects the operating
mode of the counters A, B, C and D according to the other configuration settings.
When CntPWM0 is enabled, the PWMA or PWMAB output value overrides the value set in bit 0 of RegPBOut in
the Port B peripheral. When CntPWM1 is enabled, the PWMC or PWMCD output value overrides the value set in
bit 1 of RegPBOut. The corresponding ports (0 and/or 1) of Port B must be set in digital mode and as output and
either open drain or not and pull up or not through a proper setting of the control registers of the Port B.
Counters in PWM mode always count down, the CntXDownUp bit setting must be reset. No interrupts and events
are generated by the counters which are in PWM mode. Counters do count circularly: they restart at the maximal
value (either 0xFF when not cascaded or 0xFFFF when cascaded) when respectively an underflow condition
occurs in the counting.
The internal PWM signals are low as long as the counter contents are higher than the PWM code values written in
the RegCntX registers. They are high when the counter contents are smaller or equal to these PWM code values.
The PWM resolution is always 8 bits when the counters used for the PWM signal generation are not cascaded.
PWM0Size(1:0) and PWM1Size(1:0) in the RegCntConfig2 register are used to set the PWM resolution for the
counters A and B or C and D respectively when they are in cascaded mode. The different possible resolutions in
cascaded mode are shown in Table 20-13. Choosing a 16 bit PWM code higher than the maximum value that can
be represented by the number of bits chosen for the resolution, results in a PWM output which is always tied to 1.
PwmXsize(1:0)
Resolution
11
16 bits
10
14 bits
01
12 bits
00
10 bits
Table 20-13: Resolution selection in cascaded PWM mode
Small PWM code
Large PWM code
Tper
Thlarge
Tllarge
Thsmall
Tlsmall
Figure 20-3: PWM modulation examples
The period of the PWM signal is given by the formula:
ckcnt
resolution
f
Tper
2
=
Not
Recommended
for
New
Designs
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