Atmel ATmega8535L - Page 260

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