SAM4L Datasheet, PDF (756/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
28.9.3 Timing Register
Name:
TR
Access Type:
Read/Write
Offset:
0x08
Reset Value:
0x00000000
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
• EXP: Clock Prescaler
Used to specify how to prescale the SMBus TLOWS counter. The counter is prescaled according to the following formula:
f_PRESCALED
=
f_{--C----L--K---_---T---W----I--S-}
2^{(EXP + 1)}
• 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.
42023C–SAM–02/2013
756