M16CSLASH29 datasheet(305/499 Pages) RENESAS

305 / 499 page

16. MULTI-MASTER I2C bus INTERFACE

page 281

16.12 START/STOP Condition Detect Operation

Figure 16.18

, Figure 16.19 and Table 16.10 show START/STOP condition detect operations. Bits SSC4

to SSC0 in the S2D0 register set the START/STOP conditions. The START/STOP condition can be de-

tected only when the input signal of the SCLMM and SDAMM met the following conditions: the SCL release

time, the set-up time, and the hold time (see Table 16.10). The BB flag in the S10 register is set to 1 when

the START condition is detected and it is set to 0 when the STOP condition is detected. The BB flag set and

reset timing varies between standard clock mode and high-speed clock mode. See Table 16.10.

Figure 16.18 Start condition detection timing diagram

Figure 16.19 Stop condition detection timing diagram

Standard clock mode

High-speed clock mode

SCL release time

SSC value + 1 cycle (6.25µs)

4 cycles (1.0µs)

Setup time

SSC value + 1 cycle < 4.0µs (3.25µs)

2 cycles (0.5µs)

Hold time

SSC value cycle < 4.0µs (3.0µs)

2 cycles (0.5µs)

BB flag set/reset

SSC value - 1 +2 cycles (3.375µs)

3.5 cycles (0.875µs)

time

Table 16.10 Start/Stop detection timing table

SCL release time

Hold time

Setup time

BB flag

set time

BB flag

SDA

SCL

BB flag

SDA

SCL

SCL release time

Hold time

Setup time

BB flag

set time

NOTE:

1. Unit : number of cycle for I2C system clock VIIC

The SSC value is the decimal notation value of bits SSC4 to SSC0. Do not set 0 or odd numbers to the SSC

setting. The values in ( ) are examples when the S2D0 register is set to 1816 at VIIC = 4 MHz.

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