Preliminary
PWM TIMER
S3C2451X RISC MICROPROCESSOR
13-10
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.
DMA REQUEST MODE
The PWM timer can generate a DMA request at every specific time. The timer keeps DMA request signals
(nDMA_REQ) low until the timer receives an ACK signal. When the timer receives the ACK signal, it makes the
request signal inactive. The timer, which generates the DMA request, is determined by setting DMA mode bits (in
TCFG1 register). If one of timers is configured as DMA request mode, that timer does not generate an interrupt
request. The others can generate interrupt normally.
DMA mode configuration and DMA / interrupt operation
DMA Mode
DMA Request
Timer0 INT
Timer1 INT
Timer2 INT
Timer3 INT
Timer4 INT
0000 No
select ON ON ON ON ON
0001 Timer0 OFF ON ON ON ON
0010 Timer1 ON OFF ON ON ON
0011 Timer2 ON ON OFF ON ON
0100 Timer3 ON ON ON OFF ON
0101 Timer4 ON ON ON ON OFF
0110 No
select ON ON ON ON ON
PCLK
INT4tmp
DMAreq_en
nDMA_ACK
nDMA_REQ
INT4
1 0 1
Figure 13-8. Timer4 DMA Mode Operation