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CHAPTER 12 MULTIFUNCTIONAL TIMERS
Table 12.3-11 Functions of Bits for Waveform Control Register (SIGCR)
Bit name
Function
bit7
DTIE:
Output level control
enable bit
This bit enables control of the output level of the RT0 pin through DTTI pin
input.
bit6
DTIL:
Valid input level
setting bit
This bit is used to set the valid input level of the DTTI pin.
bit5
NRSL:
Noise cancel function
setting bit
This bit is used to set the noise cancel function of the DTTI pin input.
The noise cancel function operates the 2-bit internal counter depending on
the valid input level. If the valid level is retained until an overflow of the
counter value occurs, the DTTI pin input is accepted. The pulse width of
noise that can be canceled is about 4 machine cycles.
Note:
If the noise cancel function is enabled, the DTTI pin input is disabled
when the oscillation clock is stopped in stop mode.
bit4
bit3
bit2
DCK2, DCK1, DCK0:
Operating clock
setting bit
These bits are used to set the operating clock of the 8-bit timer.
bit1
bit0
PGS1, PGS0:
PPG timer setting bit
These bits are used to set the PPG timer that is used to output PPG timer
pulses to the RT0 pin.
When the GATE signal output setting bit (GTEN) and pulse enable bit
(PGEN) of the 8-bit timer control register (DTCR) are set to "1", the
corresponding GATE signal (synchronous mode) for PPG timer operation is
output.
Note:
Even if 16-bit PPG mode is set in the PPG timer settings, the
corresponding PPG timer can output pulses and can be controlled to start/
stop it.
PPG timer pulses can be output after software activation (set by the PPG
control register (PPGC)) of the PPG timer without using the GATE signal
for PPG timer operation (asynchronous mode).