参数资料
型号: M34551E8FP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP48
封装: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件页数: 14/155页
文件大小: 1329K
代理商: M34551E8FP
APPLICATION
2.4 Carrier generating circuit
2-32
4551 Group User’s Manual
2.4.4 Notes on use
(1)
Note on the carrier generating circuit stop
In order to stop the carrier wave which has the cycle longer than that of the instruction clock with
the SPCR instruction, stop it at the point when the carrier wave outputs “L” level in the SPCR
instruction execution cycle.
If this condition is not satisfied, the last “H” output interval of carrier wave is shortened.
(2)
Notes when using the carrier wave output auto-control function
q Execute the STCR instruction after setting the timer 1 and register C2 in order to start the carrier
generating circuit operation.
q Stop the timer 1 (W20=“0”) after stopping the carrier generating circuit (SPCR instruction executed)
while the carrier wave output is disabled in order to stop the carrier wave output auto-control
operation.
q If the carrier wave output auto-control function is invalidated (C20=“0”) while the carrier wave
output is auto-controlled, the output of port CARR retains the state when the auto-control is
invalidated regardless of timer 1 underflow. This state can be terminated by timer 1 stop (W20=“0”).
When the carrier wave output auto-control function is validated (C20=“1”) again after it is invalidated
(C20=“0”), the auto-control of carrier wave output is started again when the next timer 1 underflow
occurs. However, when the carrier wave output auto-control bit is changed during timer 1 underflow,
the error-operation may occur.
q Use the carrier wave or the carrier wave divided by 2 as the timer 1 count source when the carrier
wave output auto-control function is selected.
If the ORCLK is used as the count source, a hazard wave may occur in port CARR output because
ORCLK is not synchronized with the carrier wave.
q When “no carrier wave” is selected with register C1 ((C13C12C11C10) = (0101), (1101)), the
disable/enable of the carrier wave output cannot be controlled by the carrier wave output auto-
control function.
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