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CHAPTER 16 8-/16-BIT PPG TIMER
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Details of pins in block diagram
Table 16.2-2 lists the actual pin names and interrupt request numbers of the 8-/16-bit PPG timer.
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PPG operation mode control register D (PPGCD)
This register sets the operation mode of the 8-/16-bit PPG timer, enables or disables the operation of the 8-/
16-bit PPG timer D, the pin output and an underflow interrupt, and also indicates the generation of an
underflow.
●
PPGC/D count clock select register (PPGCD)
This register sets the count clock of the 8-/16-bit PPG timer.
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PPGD reload registers (PRLHD, PRLLD)
These registers set the High width or Low width of the output pulse. The values set in these registers are
reloaded to the PPGD down counter (PCNTD) when the 8-/16-bit PPG timer D is started.
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PPGD down counter (PCNTD)
This counter is an 8-bit down counter that alternately reloads the values set in the PPGD reload registers
(PRLHD and PRLLD) to decrement. When an underflow occurs, the pin output is inverted. The 2-channel
PPG down counters (PPGC and PPGD) can also be connected for use as a single-channel 16-bit PPG down
counter.
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PPGD temporary buffer (PRLBHD)
This buffer prevents deviation of the output pulse width caused at writing to the PPG reload registers
(PRLHD and PRLLD). It stores the PRLHD value temporarily and enables it in synchronization with the
timing of writing to the PRLLD.
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Reload register L/H selector
This selector detects the current pin output level to select which register value, Low reload register
(PRLLD) or High reload register (PRLHD), should be reloaded to the PPGD down counter.
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Count clock selector
This selector selects the count clock to be inputted to the PPGD down counter from five frequency-divided
clocks of the machine clock or the frequency-divided clocks of the timebase timer.
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PPG output control circuit
This circuit inverts the pin output level and the output when an underflow occurs.
Table 16.2-2 Pins and Interrupt Request Numbers in Block Diagram
Channel Output Pin Interrupt Request
Number
PPG:REV=0 PPG:REV=1
PPGC P66 / PPGC P22 / PPGD
#23 (17
H
)
PPGD P22 / PPGD P66 / PPGC
PPGE P67/ PPGE P23 / PPGF
#24 (18
H
)
PPGF P23/ PPGF P67 / PPGE