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PRELIMINARY
S3C6400
RISC MICROPROCESSOR
Pulse Width Modulation Timer
32-11
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
OUTPUT LEVEL CONTROL
Initial State
Inverter off
inverter on
Timer stop
Period 2
Period 1
Figure 32-9: Inverter on/off
The following methods can be used to maintain TOUT as high or low.
(Assuming the inverter is off)
1. Turn off the auto-reload bit. Then, TOUTn goes to high level and the timer is stopped after TCNTn reaches
to 0. This method is recommended.
2. Stop the timer by clearing the timer start/stop bit to 0. If TCNTn <= TCMPn, the ouput level is
high
. If
TCNTn >TCMPn, the output level is
low
.
3. TOUTn can be inverted by the inverter on/off bit in TCON. The inverter removes the additional circuit to
adjust the output level.
DEAD ZONE GENERATOR
The deadzone is for the PWM control of power devices. This feature is used to insert the time gap between a
turn-off of a switching device and a turn on of the other switching device. This time gap prohibit the two switching
device turning on simultaneously even for a very short time.
TOUT0 is the PWM output. nTOUT0 is the inversion of the TOUT0. If the dead-zone is enabled, the output
wave-form of TOUT0, nTOUT0 will be TOUT0_DZ and nTOUT0_DZ. TOUT0_DZ and nTOUT0_DZ never can
be turned on simultaneously by the dead zone interval. For functional correctness, the deadzone length must be
set smaller than compare counter value.