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CHAPTER 16 8-/16-BIT PPG TIMER
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Output waveform in 8-bit PPG output 2-channel independent operation mode
The High and Low pulse widths to be outputted are determined by adding 1 to the value in the PPG reload
register and multiplying it by the count clock cycle. For example, if the value in the PPG reload register is
"00
H
", the pulse width has one count clock cycle, and if the value is "FF
H
", the pulse width has 256 count
clock cycles.
The equations for calculating the pulse width are shown below:
P
L
=T × (L+1)
P
H
=T × (H+1)
P
L
: Low width of output pulse
P
H
: High width of output pulse
L: Values of 8 bits in PPG reload register (PRLLn or PRLLm)
H: Values of 8 bits in PPG reload register (PRLHn or PRLHm)
T: Count clock cycle
Figure 16.5-3 shows the output waveform in the 8-bit PPG output 2-channel independent operation mode.
Figure 16.5-3 Output Waveform in 8-bit PPG Output 2-channel Independent Operation Mode
T × (L + 1)
T × (H + 1)
Operating start Operating stop
PPG operating enable
bit (PEN)
PPG output pin
L : Value of PPG reload register (PRLL)
H : Value of PPG reload register (PRLH)
T : Count clock cycle
Note: n = C, E
m = n + 1