M38049F5HKP datasheet(85/387 Pages) RENESAS

85 / 387 page

1-67

REJ09B0212-0100Z

Rev.1.00

Jan 14, 2005

3804 Group (Spec.H)

HARDWARE

FUNCTIONAL DESCRIPTION

Fig. 64 START/STOP condition detecting timing diagram

START/STOP Condition Detecting Operation

The START/STOP condition detection operations are shown in

Figures 64, 65, and Table 11. The START/STOP condition is set

by the START/STOP condition set bit.

The START/STOP condition can be detected only when the input

signal of the SCL and SDA pins satisfy three conditions: SCL re-

lease time, setup time, and hold time (see Table 11).

The BB flag is set to “1” by detecting the START condition and is

reset to “0” by detecting the STOP condition.

The BB flag set/reset timing is different in the standard clock mode

and the high-speed clock mode. Refer to Table 11, the BB flag set/

reset time.

Note: When a STOP condition is detected in the slave mode (MST = 0), an

interrupt request signal “I2CIRQ” occurs to the CPU.

Table 11 START condition/STOP condition detecting conditions

Note: Unit : Cycle number of internal clock

SSC value is the decimal notation value of the START/STOP condi-

tion set bits SSC4 to SSC0. Do not set “0” or an odd number to SSC

value. The value in parentheses is an example when the I2C START/

STOP condition control register is set to “1816” at

φ = 4 MHz.

Fig. 65 STOP condition detecting timing diagram

SCL release time

Standard clock mode

High-speed clock mode

4 cycles (1.0

µs)

2 cycles (0.5

µs)

2 cycles (0.5

µs)

3.5 cycles (0.875

µs)

SSC value + 1

SSC value –1

Setup time

Hold time

BB flag set/

reset time

SSC value + 1 cycle (6.25

µs)

cycle < 4.0

µs (3.125 µs)

cycle < 4.0

µs (3.125 µs)

+ 2 cycles (3.375

µs)

Hold time

Setup

time

SCL

SDA

BB flag

SCL release time

BB flag

set time

Hold time

Setup

time

SCL

SDA

BB flag

SCL release time

BB flag

reset

time

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