ATtiny48 datasheet(208/266 Pages) ATMEL

Part #	ATtiny48

Description	8-bit Microcontroller with 4/8K Bytes In-System Programmable Flash

PDF	266 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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208 / 266 page

208

8008C–AVR–03/09

ATtiny48/88

4. fCK = CPU clock frequency

5. This requirement applies to all 2-wire serial interface operation in ATtiny48/88. Other devices connected to the 2-wire serial

bus need only obey the general f

SCL requirement.

6. The actual low period generated by the 2-wire serial interface of ATtiny48/88 is (1/fSCL - 2/fCK), thus fCK 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 2-wire serial interface of ATtiny48/88 is (1/f

SCL - 2/fCK), thus the low time requirement

will not be strictly met for fSCL > 308 kHz when fCK = 8 MHz. Still, ATtiny48/88 devices connected to the bus may communi-

cate at full speed (400 kHz) with other ATtiny48/88 devices, as well as any other device with a proper t

LOW acceptance

margin.

Figure 21-3. 2-wire Serial Bus Timing

tSU;STA

tLOW

tHIGH

tLOW

tof

tHD;STA

tHD;DAT

tSU;DAT

tSU;STO

tBUF

SCL

SDA

ATtiny48 Datasheet(PDF) 208 Page - ATMEL Corporation