Datasheet

8−Bit Shift Register
USISRL
MSB
LSB
USIGE
D
G
Q
SDA
D Q
Set USIAL,
Clear USIOE
SCL
USIIFG
USIMST
START
Detect
Set USISTTIFG
Shift Clock
0
1
Set USIIFG
USICNTx
USICKPL
USICKPH
USIOE
STOP
Detect
Set USISTP
USISTTIFG
USISSELx
SMCLK
SMCLK
SCLK
ACLK
000
001
010
011
TA1
TA2
SWCLK
TA0
100
101
110
111
Clock Divider
/1/2/4/8... /128
USIDIVx
0
1
USICLK
HOLD
SCL Hold
EN
ENUSISWRST
USISCLREL
USIPE7
USIPE6
Bit Counter
USIIFGCC
USII2C = 1
USICKPL = 1
USICKPH = 0
USILSB = 0
USI16B = 0
USI Introduction www.ti.com
Figure 14-2. USI Block Diagram: I
2
C Mode
398
Universal Serial Interface (USI) SLAU144J–December 2004–Revised July 2013
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