Atmel ATmega8535L User Manual page 260

4. f = CPU clock frequency.
CK
5. This requirement applies to all ATmega8535 Two-wire Serial Interface operation. Other devices connected to the Two-wire
Serial Bus need only obey the general f
6. The actual low period generated by the ATmega8535 Two-wire Serial Interface is (1/f
than 6 MHz for the low time requirement to be strictly met at f
7. The actual low period generated by the ATmega8535 Two-wire Serial Interface is (1/f
ment will not be strictly met for f
communicate at full speed (400 kHz) with other ATmega8535 devices, as well as any other device with a proper t
tance margin.
Figure 127. Two-wire Serial Bus Timing
SCL
t
SU;STA
SDA
ATmega8535(L)
260
requirement.
SCL
> 308 kHz when f
SCL
t
HIGH
t
of
t
LOW
t t
HD;STA HD;DAT
= 100 kHz.
SCL
= 8 MHz. Still, ATmega8535 devices connected to the bus may
CK
t
LOW
t
SU;DAT
- 2/f ), thus f must be greater
SCL CK CK
- 2/f ), thus the low time require-
SCL CK
LOW
t
r
t
SU;STO
2502K–AVR–10/06
accep-
t
BUF