Overview Of Remote-Control Transmission Frequency Generator; Table 13.1-1 Output Cycle And Variable "H" Width Ranges - Fujitsu F2MC-8L Series Hardware Manual

CHAPTER 13 REMOTE-CONTROL TRANSMISSION FREQUENCY GENERATOR
13.1 Overview of Remote-control Transmission Frequency
Generator
The remote-control transmission frequency generator is a 6-bit binary counter that
offers a choice of four different internal count clocks, allowing the cycle and "H" width
of the output waveform to be set. This circuit can therefore be used as a 6-bit PPG
(programmable pulse generator). The output pin also serves as the buzzer output pin.
Remote-control Transmission Frequency Generation Functions
• The remote-control transmission frequency generator generates the frequency to be used for
a remote controller and outputs it to the RCO pin.
• The cycle and "H" width of the output waveform can be set independently.
• The count clock can be selected from among four different internal clocks.
• The frequency generator can generate a frequency between two and 2
clock cycle.
• The output is shared with the buzzer output. Buzzer output takes priority over remote-control
transmission frequency output.
Table 13.1-1 lists the output cycle and variable "H" width ranges.

Table 13.1-1 Output Cycle and Variable "H" Width Ranges

Internal count clock cycle
0.5 t
ins
1 t
inst
8 t
inst
32 t
inst
t : Instruction cycle (variable with, e.g., clock mode)
inst
There is difference
internal count clock cycle.The following gives an example.
Tip:
In case of selecting 0.5 t
width of the waveform output by the remote-control transmission frequency generator.
When the count clock cycle is set to 0.5 t
4.2 MHz, assuming:
Value compared for cycle = "011110
Value compared for "H" width = "001010
the "H" width and cycle of the output waveform is obtained as shown below.
Cycle
276
Output cycle
1 t to 32 t
inst inst
2 t to 63 t
inst inst
16 t to 504 t
inst inst
64 t to 2016 t
inst
of calculating the cycle between selecting 0.5t
, the following gives an example of calculating the cycle and "H"
inst
" (30-clock cycle)
B
B
= (Value compared for cycle + 1) × 0.5 t
inst
for operation at a main clock oscillation (F
inst
" (10-clock width)
inst
6
times the count
Output "H" Width
0.5 t to 31.5 t
inst inst
1 t to 62 t
inst inst
8 t to 496 t
inst inst
32 t to 1984 t
inst inst
and selecting other
inst
) of
C