M37151M8-XXXFP datasheet(39/139 Pages) RENESAS

Part #	M37151M8-XXXFP

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP

MITSUBISHI MICROCOMPUTERS

38

Rev. 1.0

8.6.8 START/STOP Condition Detect Conditions

The START/STOP condition detect conditions are shown in

Figure 8.6.12 and Table 8.6.3. Only when the 3 conditions of Table

8.6.3 are satisfied, a START/STOP condition can be detected.

Note: When a STOP condition is detected in the slave mode

(MST = 0), an interrupt request signal “IICIRQ” is generated to the

CPU.

Fig. 8.6.12 START Condition/STOP Condition Detect Timing

Diagram

Standard Clock Mode

6.5

µs (26 cycles) < SCL

release time

3.25

µs (13 cycles) < Setup time

3.25

µs (13 cycles) < Hold time

High-speed Clock Mode

1.0

µs (4 cycles) < SCL

release time

0.5

µs (2 cycles) < Setup time

0.5

µs (2 cycles) < Hold time

Table 8.6.3 START Condition/STOP Condition Detect Conditions

Note: Absolute time at

φ = 4 MHz. The value in parentheses denotes the num-

ber of

φ cycles.

Hold time

Setup

time

SCL

SDA

(START condition)

SDA

(STOP condition)

SCL release time

Hold time

Setup

time

8.6.9 Address Data Communication

There are two address data communication formats, namely, 7-bit

addressing format and 10-bit addressing format. The respective ad-

dress communication formats are described below.

(1) 7-bit addressing format

To support the 7-bit addressing format, set the 10BIT SAD bit of the

I2C control register (address 00F916) to “0.” The first 7-bit address

data transmitted from the master is compared with the high-order 7-

bit slave address stored in the I2C address register (address 00F716).

At the time of this comparison, address comparison of the RBW bit of

the I2C address register (address 00F716) is not made. For the data

transmission format when the 7-bit addressing format is selected,

refer to Figure 8.6.13, (1) and (2).

(2) 10-bit addressing format

To support the 10-bit addressing format, set the 10BIT SAD bit of the

I2C control register (address 00F916) to “1.” An address comparison

is made between the first-byte address data transmitted from the

master and the 7-bit slave address stored in the I2C address register

(address 00F716). At the time of this comparison, an address com-

parison is performed between the RBW bit of the I2C address regis-

–

ter (address 00F716) and the R/W bit, which is the last bit of the

address data transmitted from the master. In the 10-bit addressing

–

mode, the R/W bit not only specifies the direction of communication

for control data but is also processed as an address data bit.

When the first-byte address data matches the slave address, the

AAS bit of the I2C status register (address 00F816) is set to “1.” After

the second-byte address data is stored into the I2C data shift register

(address 00F616), perform an address comparison between the sec-

ond-byte data and the slave address by software. When the address

data of the 2nd byte matches the slave address, set the RBW bit of

the I2C address register (address 00F716) to “1” by software. This

–

processing can match the 7-bit slave address and R/W data, which

are received after a RESTART condition is detected, with the value

of the I2C address register (address 00F716). For the data transmis-

sion format when the 10-bit addressing format is selected, refer to

Figure 8.6.13, (3) and (4).

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