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The following shows the SD host block diagram:
PWM timer
www.digiembedded.com
The S3C2443 has five 16-bit timers. Timer 0, 1, 2, and 3 have Pulse Width Modulation
(PWM) function. Timer 4 has an internal timer only with no output pins. The timer 0
has a dead-zone generator, which is used with a large current device. The timer 0 and
1 share an 8-bit prescaler, while the timer 2, 3 and 4 share other 8-bit prescaler. Each
timer has a clock divider, which generates 5 different divided signals (1/2, 1/4, 1/8,
1/16, and TCLK). Each timer block receives its own clock signals from the clock
divider, which receives the clock from the corresponding 8-bit prescaler. The 8-bit
prescaler is programmable and divides the PCLK according to the loading value,
which is stored in TCFG0 and TCFG1 registers.
The timer count buffer register (TCNTBn) has an initial value which is loaded into the
down-counter when the timer is enabled. The timer compare buffer register
(TCMPBn) has an initial value which is loaded into the compare register to be
compared with the down-counter value. This double buffering feature of TCNTBn and
TCMPBn makes the timer generate a stable output when the frequency and duty ratio
are changed.
Each timer has its own 16-bit down counter, which is driven by the timer clock. When
the down counter reaches zero, the timer interrupt request is generated to inform
the CPU that the timer operation has been completed. When the timer counter
reaches zero, the value of corresponding TCNTBn is automatically loaded into the
down counter to continue the next operation. However, if the timer stops, for
example, by clearing the timer enable bit of TCONn during the timer running mode,
the value of TCNTBn will not be reloaded into the counter.
The value of TCMPBn is used for pulse width modulation (PWM). The timer control
logic changes the output level when the down-counter value matches the value of the
compare register in the timer control logic. Therefore, the compare register
determines the turn-on time (or turn-off time) of a PWM output.
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