H8SSLASH2224 datasheet(763/1071 Pages) RENESAS

763 / 1071 page

Section 16 I

2C Bus Interface (IIC) (Option)

Rev. 5.00 Aug 08, 2006 page 677 of 982

REJ09B0054-0500

Table 16.7 I2C Bus Timing (SCL and SDA Output)

Item

Symbol

Output Timing

Unit

Notes

SCL output cycle time

tSCLO

28 tcyc to 256 tcyc

SCL output high pulse width

tSCLHO

0.5 tSCLO

SCL output low pulse width

tSCLLO

0.5 tSCLO

SDA output bus free time

tBUFO

0.5 tSCLO – 1 tcyc

Start condition output hold time

tSTAHO

0.5 tSCLO – 1 tcyc

Retransmission start condition

output setup time

tSTASO

1 tSCLO

Stop condition output setup time

tSTOSO

0.5 tSCLO + 2 tcyc

Data output setup time (master)

tSDASO

1 tSCLLO – 3 tcyc

Data output setup time (slave)*

1 tSCLL – 3 tcyc

Data output setup time (slave)*

1 tSCLL – (6 tcyc or 12 tcyc)*

Data output hold time

tSDAHO

3 tcyc

Figure 27.31

Notes: 1. Not supported by the H8S/2258 Group.

2. Supported only by the H8S/2258 Group.

3. 6 tcyc when IICX is 0, 12 tcyc when IICX is 1.

4. SCL and SDA inputs are sampled in synchronization with the internal clock. The AC timing

therefore depends on the system clock cycle tcyc, as shown in table 27.22 (H8S/2239 Group)

and table 27.34 (H8S/2238B and H8S/2236B). Note that the I2C bus interface AC timing

specifications will not be met with a system clock frequency of less than 5 MHz.

5. The I2C bus interface specification for the SCL rise time tsr is under 1000 ns (300 ns for high-

speed mode). In master mode, the I2C bus interface monitors the SCL line and synchronizes

one bit at a time during communication. If tsr (the time for SCL to go from low to VIH) exceeds

the time determined by the input clock of the I2C bus interface, the high period of SCL is

extended. The SCL rise time is determined by the pull-up resistance and load capacitance of

the SCL line. To insure proper operation at the set transfer rate, adjust the pull-up resistance

and load capacitance so that the SCL rise time does not exceed the values given in the table in

table 16.8.

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