參數(shù)資料
型號(hào)： M34551
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTER
中文描述： 單芯片4位CMOS微機(jī)紅外遙控器
文件頁(yè)數(shù)： 24/68頁(yè)
文件大?。?/td> 698K
代理商： M34551
24
MITSUBISHI MICROCOMPUTERS
4551 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for
INFRARED REMOTE CONTROL TRANSMITTER
Table 11 Carrier generating circuit control register and control flag
C2
0
Auto-control output by timer 1 is invalid
Auto-control output by timer 1 is valid
Carrier wave output auto-control bit
0
1
at reset : 0
2
Carrier wave output control register C2
at power down : 0
2
W
CR
Carrier wave generating stop (SPCR instruction)
Carrier wave generating start (STCR instruction)
Carrier wave generating control
0
1
at reset : 0
2
Carrier wave generating control flag CR
at power down : 0
2
W
Note: “W” represents write enabled.
(1) Carrier generating circuit related registers
G
Carrier wave selection register C1
Each carrier waveform can be selected by setting the register
C1. Set the contents of this register through register A with
the TC1A instruction.
G
Carrier wave output control register C2
Timer 1 can auto-control the output enable interval and the
output disable interval of the carrier wave output from port
CARR by setting the register C2. Set the contents of this
register through register A with the TC2A instruction.
The setting of the output enable/disable interval is described
below.
Validate the carrier wave output auto-control function
(C2
0
=“1”).
Select the carrier wave or the carrier wave divided by 2
as the timer 1 count source.
Set the count value (the output enable interval of carrier
wave from port CARR) to timer 1.
Operate timer 1 (W2
0
=“1”).
Operate the carrier generating circuit (STCR instruction
executed).
Set the next count value (the output disable interval of
carrier wave from port CARR) to reload register R1 before
timer 1 underflow occurs.
The carrier wave is output from port CARR until the first timer
1 underflow occurs. The output of the carrier wave from port
CARR is disabled and the next count value is loaded from
reload register R1 to timer 1 by the first timer 1 underflow.
Then, the output of carrier wave is disabled until the second
timer 1 underflow. Also, the next enable interval of the carrier
wave output can be set by setting the third count value to
timer 1 reload register before the second timer 1 underflow
occurs. If the carrier wave output auto-control function is
invalidated (C2
0
=“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 (W2
0
=“0”). When
the carrier wave output auto-control function is validated
(C2
0
=“1”) again after it is invalidated (C2
0
=“0”), the auto-
control of carrier wave output is started again when the next
timer 1 underflow occurs.
(2) Carrier wave generating control flag (CR)
The CR flag is used to control the carrier wave generating
operation of the carrier generating circuit. The CR flag is “1”
and the carrier wave generating is started by executing the
STCR instruction. The CR flag is “0” and the carrier wave
generating is stopped by executing the SPCR instruction. The
CR flag is “0” at system reset.
(3) 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.
(4)
Notes when using the carrier wave output auto-control function
G
Execute the STCR instruction after setting the timer 1 and
register C2 in order to start the carrier generating circuit
operation.
G
Stop the timer 1 (W2
0
=“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.
G
If the carrier wave output auto-control function is invalidated
(C2
0
=“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 (W2
0
=“0”).
When the carrier wave output auto-control function is
validated (C2
0
=“1”) again after it is invalidated (C2
0
=“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.
G
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 may
occur in port CARR output because ORCLK is not
synchronized with the carrier wave.
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