AT32UC3C1512C Automotive Atmel Corporation, AT32UC3C1512C Automotive Datasheet - Page 715

• Manufacturer Part Number: AT32UC3C1512C Automotive
• Manufacturer: Atmel Corporation

27.9.3
Name:
Access Type:
Offset:
Reset Value:
• EXP: SMBus Timeout Clock Prescaler
• THMAX: Clock High Maximum Cycles
• TLOWM: Master Clock Stretch Maximum Cycles
• TLOWS: Slave Clock Stretch Maximum Cycles
9166C–AVR-08/11
31
23
15
7
Used to specify how to prescale the TIM and TLOWM counters in SMBTR. Counters are prescaled according to the following
formula
Clock cycles in clock high maximum count. Prescaled by SMBTR.EXP. Used for bus free detection. Used to time T
NOTE: Uses the prescaler specified by CWGR, NOT the prescaler specified by SMBTR.
Clock cycles in master maximum clock stretch count. Prescaled by SMBTR.EXP. Used to time T
Clock cycles in slave maximum clock stretch count. Prescaled by SMBTR.EXP. Used to time T
SMBus Timing Register
f
prescaled SMBus
,
30
22
14
6
SMBTR
Read/Write
0x08
0x00000000
=
EXP
f
------------------------
2
CLKTWIM
(
EXP
+
1
)
29
21
13
5
28
20
12
4
TLOWM
THMAX
TLOWS
27
19
11
3
-
26
18
10
2
-
LOW:SEXT
LOW:MEXT
25
17
9
1
-
.
AT32UC3C
HIGH:MAX
24
16
8
0
-
.
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