Atmel SAM4S-EK2 Atmel ATSAM4S-EK2 ATSAM4S-EK2 Data Sheet
Product codes
ATSAM4S-EK2
890
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
38.7.9 PWM Sync Channels Mode Register
Name:
PWM_SCM
Address:
0x40020020
Access:
Read-write
This register can only be written if the bits WPSWS2 and WPHWS2 are cleared in
• SYNCx: Synchronous Channel x
0 = Channel x is not a synchronous channel.
1 = Channel x is a synchronous channel.
• UPDM: Synchronous Channels Update Mode
Notes: 1. The update occurs at the beginning of the next PWM period, when the UPDULOCK bit in
is set.
2. The update occurs when the Update Period is elapsed.
• PTRM: PDC Transfer Request Mode
• PTRCS: PDC Transfer Request Comparison Selection
Selection of the comparison used to set the flag WRDY and the corresponding
PDC
transfer request.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
PTRCS
PTRM
–
–
UPDM
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
–
7
6
5
4
3
2
1
0
–
–
–
–
SYNC3
SYNC2
SYNC1
SYNC0
Value
Name
Description
0
MODE0
1
MODE1
Manual write of double buffer registers and automatic update of synchronous channels
2
MODE2
Automatic write of duty-cycle update registers by the PDC and automatic update of synchronous
channels
channels
3
–
Reserved
UPDM
PTRM
WRDY Flag and PDC Transfer Request
0
x
and the PDC transfer request
are never set to 1.
1
x
The WRDY flag in
update period is elapsed, the PDC transfer request is never set to 1.
2
0
and the PDC transfer request
are set to 1 as soon as the update period is elapsed.
1
and the PDC transfer request
are set to 1 as soon as the selected comparison matches.