参数资料
型号: MC68HC705CT4FN
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.048 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 148/152页
文件大小: 668K
代理商: MC68HC705CT4FN
Pulse Width Modulator (PWM)
Functional Description
MC68HC705CT4 Rev. 2.0
General Release Specification
MOTOROLA
Pulse Width Modulator (PWM)
95
NON-DISCLOSURE
AGREEMENT
REQUIRED
12.3 Functional Description
A $00 in the PWM data register yields an off output (0%), but a $3F
yields a duty of 63/64 (98.4%).
When not in use, the PWM system can be shut off to save power by
clearing the PWME bit in MISCR.
Writes to the PWM data register can be performed at any time without
affecting the current PWM output signal. Updates on the PWM output
occur at the end of the PWM period (E x 64). At this time, the new value
is loaded into the PWM data register. If a write to the registers is
performed while the PWM is disabled, data is transferred directly to the
PWM register. A read of the data register reads the active count in
progress, not the buffered value.
After the PWM is enabled (PWM = 1) the PWM output remains low for
one E cycle. This allows synchronization and will not occur again until
the next time the PWM is enabled.
Figure 12-2. PWM Waveforms
10
3F
20
64 x E
0
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