Notes On Using Remote-Control Transmission Frequency Generator - Fujitsu F2MC-8L Series Hardware Manual

13.6 Notes on Using Remote-control Transmission Frequency
Generator
This section gives notes on using the remote-control transmission frequency
generator.

Notes on Using Remote-control Transmission Frequency Generator

Switching the output pin
The P37/BZ/RCO pin serves as a general-purpose port, buzzer output, or remote-control
transmission frequency output pin. Note that this pin gives priority to buzzer output. To use the
pin as the remote-control transmission frequency output pin, therefore, be sure to write "00
the buzzer register (BZCR) to disable buzzer output.
Restriction on "H" width set value
In case of selecting 0.5 t
HSC0) in remote-control transmission frequency control register 1 (RCR1) must be set between
"00 " and "3E
H
In case of selecting 1/8/32 t
HSC0) in remote-control transmission frequency control register 1 (RCR1) must be set between
"01 " and "3E
H
In case of selecting 0.5/1/8/32 t
smaller than the value in the cycle sett bits (SCL5 to SCL0) in remote-control transmission
frequency control register 2 (RCR2). If the value is equal to or greater than that value in
remote-control transmission frequency control register 2 (RCR2), keeps the RCO pin at the "H"
output level.
Resolution
In case of selecting 0.5 t
cycle (set to "3F
by reducing the cycle set value.
In case of selecting 1/8/32 t
cycle (set to "3F
by reducing the cycle set value.
Changing set values during operation
The 6-bit counter for remote-control transmission frequency generation is compared directly with
the "H" width set bits (RCR1: HSC5 to HSC0) and with the cycle set bits (RCR2: SCL5 to
SCL0). If the cycle or "H" width set value is changed during operation of the counter, it may
cause an overflow, making the cycle longer until the next match is detected or the "H" width
longer until a match is detected in the next cycle.
Figure 13.6-1 illustrates the effects of changing set values during operation of the remote-
control transmission frequency generator.
13.6 Notes on Using Remote-control Transmission Frequency Generator
(internal count clock),the value in the "H" width sett bits (HSC5 to
inst
".
H
(internal count clock),the value in the "H" width sett bits (HSC5 to
inst
". Setting the bits to "00
H
inst
(internal count clock), the "H" width resolution is up to 1/64 of the
inst
"). The resolution is limited to be a minimum of 1/2 of the cycle (set to "01
H
(internal count clock), the "H" width resolution is up to 1/63 of the
inst
"). The resolution is limited to be a minimum of 1/2 of the cycle (set to "02
H
" keeps the RCO pin at the "H" output level of 0.5 t
H
(internal count clock), the value must also be set to be
" to
H
.
inst
")
H
")
H
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