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2.8 Remote-control Carrier Frequency Generator
[Bits 5 to 0] SCL5 to SCL0: Bits for setting cycle of remote-control carrier frequency
These bits are used for the 6-bit compare register to set the cycle of the remote-control carrier
frequency. To set the cycle of the remote-control carrier frequency, set the value subtracted 1
from the value calculated from the clock source in binary at these bits. For example, to set a
cycle of 60 ms, select reference clock = 4/f and set 111011 (1/60 oscillation) at these 6 bits.
This enables selection of a cycle of 60
µ
s.
■
Description of Operation
Remote-control registers 1 and 2 (RCR1 and RCR2) control a 6-bit counter to output the
remote-control carrier frequency to the P37/BZ/RCO pin.
A usage example is given below.
<Example>
Cycle: about 20 kHz
Duty: 1/3
Reference clock: 4/f (f = source clock)
Note:
To set the duty and cycle, the cycle set value must always be greater than the set duty
value.
RCR
1 set va
l
ue: 01 010000
Duty set value (1/22 oscillation)
Reference clock set value
RCR
2 set va
l
ue: 1
X
110001
Cycle set value (1/50 oscillation)
Output enable
Cycle = 50.0 µs
Duty = 17 µs