Atmel SAM4L-EK Atmel ATSAM4L-EK ATSAM4L-EK Data Sheet
Product codes
ATSAM4L-EK
761
42023E–SAM–07/2013
ATSAM4L8/L4/L2
28.9.3
Timing Register
Name:
TR
Access Type:
Read/Write
Offset:
0x08
Reset Value:
0x00000000
• EXP: Clock Prescaler
Used to specify how to prescale the SMBus TLOWS counter. The counter is prescaled according to the following formula:
• SUDAT: Data Setup Cycles
Non-prescaled clock cycles for data setup count. Used to time T
SU_DAT
. Data is driven SUDAT cycles after TWCK low detected.
This timing is used for timing the ACK/NAK bits, and any data bits driven in slave transmitter mode.
• TTOUT: SMBus T
TIMEOUT
Cycles
Prescaled clock cycles used to time SMBus T
TIMEOUT
.
• TLOWS: SMBus T
LOW:SEXT
Cycles
Prescaled clock cycles used to time SMBus T
LOW:SEXT
.
31
30
29
28
27
26
25
24
EXP
-
-
-
-
23
22
21
20
19
18
17
16
SUDAT
15
14
13
12
11
10
9
8
TTOUT
7
6
5
4
3
2
1
0
TLOWS
f
PRESCALED
f
CLK_TWIS
2
EXP
1
+
(
)
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=