Samsung S3C2440A - Manual (Page 289)

S3C2440A RISC MICROPROCESSOR PWM TIMER
10-5
TIMER INITIALIZATION USING MANUAL UPDATE BIT AND INVERTER BIT
An auto reload operation of the timer occurs when the down counter reaches 0. So, a starting value of the TCNTn
has to be defined by the user in advance. In this case, the starting value has to be loaded by the manual update
bit. The following steps describe how to start a timer:
1) Write the initial value into TCNTBn and TCMPBn.
2) Set the manual update bit of the corresponding timer. It is recommended that you configure the inverter on/off
bit. (Whether use inverter or not).
3) Set start bit of the corresponding timer to start the timer (and clear the manual update bit).
If the timer is stopped by force, the TCNTn retains the counter value and is not reloaded from TCNTBn. If a new
value has to be set, perform manual update.
NOTE
Whenever TOUT inverter on/off bit is changed, the TOUTn logic value will also be changed whether the
timer runs. Therefore, it is desirable that the inverter on/off bit is configured with the manual update bit.