15. Combination of USART, SPI, and I2C (USI)
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15.15
USIn I2C START/repeated START/STOP
One master can issue a START (S) condition to notice other devices connected to the SCLn, SDAn
lines that it will use the bus. A STOP (P) condition is generated by the master to release the bus lines
so that other devices can use it.
A high to low transition on the SDAn line while SCLn is high defines a START (S) condition.
A low to high transition on the SDAn line while SCLn is high defines a STOP (P) condition.
START and STOP conditions are always generated by the master. The bus is considered to be busy
after START condition. The bus is considered to be free again after STOP condition, i.e., the bus is
busy between START and STOP condition. If a repeated START condition (Sr) is generated instead of
STOP condition, the bus stays busy. So, the START and repeated START conditions are functionally
identical.
Figure 91. START and STOP Condition (USIn)
SCLn
SDAn
START Condition
S
P
STOP Condition
Содержание A96G150
Страница 126: ...12 Timer 0 1 2 3 4 5 A96G150 User s manual 126 Figure 43 16 bit Timer Counter Mode Operation Example...
Страница 136: ...12 Timer 0 1 2 3 4 5 A96G150 User s manual 136 Figure 51 16 bit Timer Counter Mode Operation Example...
Страница 147: ...A96G150 User s manual 12 Timer 0 1 2 3 4 5 147 Figure 59 16 bit Timer Counter Mode Operation Example...
Страница 157: ...A96G150 User s manual 12 Timer 0 1 2 3 4 5 157 Figure 67 16 bit Timer Counter Mode Operation Example...
Страница 171: ...A96G150 User s manual 14 12 bit ADC 171 Figure 79 ADC Operation Flow Sequence...
Страница 333: ...A96G150 User s manual Revision history 333 Revision history Revision Date Notes 1 00 2022 06 22 First creation...