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M37151 Datasheet(PDF) 37 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) 37 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
36
Rev. 1.0
(8) Bit 7: Communication mode specification bit
(master/slave specification bit: MST)
This bit is used for master/slave specification in data communica-
tions. When this bit is “0,” the slave is specified, so that a START
condition and a STOP condition generated by the master are received,
and data communication is performed in synchronization with the
clock generated by the master. When this bit is “1,” the master is
specified and a START condition and a STOP condition are gener-
ated, and also the clocks required for data communication are gen-
erated on the SCL.
The MST bit is cleared to “0” in any of the following conditions.
• Immediately after completion of 1-byte data transmission when
arbitration lost is detected
• When a STOP condition is detected.
• When occurence of a START condition is disabled by the START
condition duplication prevention function (Note).
• At reset
Fig. 8.6.8 I2C Status Register
b7 b6 b5 b4 b3 b2 b1 b0
I2C status register (S1) [Address 00F816]
I
2C Status Register
0
3
4
5
6, 7
b7 b6
0
0 : Slave recieve mode
0
1 : Slave transmit mode
1
0 : Master recieve mode
1
1 : Master transmit mode
1
2
0
0
0
1
0
B
Name
Functions
After reset
Communication mode
specification bits
(TRX, MST)
0 : Bus free
1 : Bus busy
Bus busy flag (BB)
0 : Interrupt request issued
1 : No interrupt request issued
I2C-BUS interface interrupt
request bit (PIN)
0 : Not detected
1 : Detected
Arbitration lost detecting flag
(AL) (See note)
0 : Address mismatch
1 : Address match
Slave address comparison
flag (AAS) (See note)
0 : No general call detected
1 : General call detected
General call detecting flag
(AD0) (See note)
0 : Last bit = “0 ”
1 : Last bit = “1 ”
Last receive bit (LRB)
(See note)
Note : These bits and flags can be read out, but cannnot be written.
Indeterminate
0
W
R
R
R —
R —
R —
RW
RW
RW
(See note)
(See note)
(See note)
(See note)
Fig. 8.6.9 Interrupt Request Signal Generation Timing
SCL
PIN
IICIRQ
Note: The START condition duplication prevention function disables the START
condition generation, bit counter reset, and SCL output, when the follow-
ing condition is satisfied:
a START condition is set by another master device.


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