參數(shù)資料
型號(hào)： MC68HC708MP16
廠商： Motorola, Inc.
英文描述： 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述： 8位微控制器單元（MCU）。（8位微控制器）
文件頁數(shù)： 18/44頁
文件大?。?/td> 342K
代理商： MC68HC708MP16
Application Note
AN1712
18
MOTOROLA
Be Direct
On occasion, software may need direct control over the PWM outputs.
For example, when the drive is first powered up or reset, software may
perform drive diagnostics where each power device is controlled
individually. In such instances, the user will find the PWM output control
port to be a useful feature on the 'MP16.
By setting the OUTCTL bit in the PWMOUT register, the PWM generator
is disconnected from the output pins, even though it continues to run.
PWM outputs are then controlled directly by bits OUT1–OUT6 in the
PWMOUT register.
However, unlike ordinary I/O ports, the PWM output control port provides
two protection features for the drive hardware:
Dead-time is still active for complementary outputs if
complementary mode is enabled. For example, there is no way to
have both PWM1 and PWM2 active at the same time nor to have
the dead-time between the assertion of one and the negation of
the other to be violated.
The OUTx bits do not control the actual voltage level at the PWM
pins; only whether they are asserted or negated. The polarity
convention established by the TOPPOL and BOTPOL bits is still
in effect.
Again, the thinking is to prevent accidental damage to the drive
hardware in the event of runaway code (or a temporary moment of
insanity exhibited by the software engineer).
A table showing output performance for OUTx bit conditions is located in
the user's manual for both complementary and independent modes of
operation.
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