Datasheet

491
32133D–11/2011
UC3D
24.9.3 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
76543210
TLOWS
f
PRESCALED
f
CLK_TWIS
2
EXP 1+()
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