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M37151 Datasheet(PDF) 39 Page - Renesas Technology Corp

Part No. M37151
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M37151 Datasheet(HTML) 39 Page - Renesas Technology Corp

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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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