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M37151 Datasheet(PDF) 42 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) 42 Page - Renesas Technology Corp

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP
41
Rev. 1.0
(3) RESTART condition generation procedure
➀ Procedure example (The necessary conditions for the procedure
are described in ➁ to ➅ below.)
Execute the following procedure when the PIN bit is “0.”
LDM
#$00, S1
(Select slave receive mode)
LDA
(Take out slave address value)
SEI
(Interrupt disabled)
STA
S0
(Write slave address value)
LDM
#$F0, S1
(Trigger RESTART condition generation)
CLI
(Interrupt enabled)
➁ Select the slave receive mode when the PIN bit is “0.” Do not write
“1” to the PIN bit. Neither “0” nor “1” is specified for the writing to
the BB bit.
The TRX bit becomes “0” and the SDA pin is released.
➂ The SCL pin is released by writing the slave address value to the
I2C data shift register. Use “STA,” “STX” or “STY” of the zero page
addressing instruction for writing.
➃ Use “LDM” instruction for setting trigger of RESTART condition
generation.
➄ Write the slave address value of ➂ and set trigger of RESTART
condition generation of ➃ continuously, as shown in the procedure
example.
➅ Disable interrupts during the following two process steps:
• Write slave address value
• Trigger RESTART condition generation
(4) STOP condition generating procedure
➀ Procedure example (The necessary conditions for the procedure
are described in ➁ to ➃ below.)
SEI
(Interrupt disabled)
LDM #$C0, S1
(Select master transmit mode)
NOP
(Set NOP)
LDM #$D0, S1
(Trigger STOP condition generation)
CLI
(Interrupt enabled)
➁ Write “0” to the PIN bit when master transmit mode is selected.
➂ Execute “NOP” instruction after master transmit mode is set. Also,
set trigger of STOP condition generation within 10 cycles after se-
lecting the master trasmit mode.
➃ Disable interrupts during the following two process steps:
• Select master transmit mode
• Trigger STOP condition generation
(5) Writing to I2C status register
Do not execute an instruction to set the PIN bit to “1” from “0” and an
instruction to set the MST and TRX bits to “0” from “1” simultaneously
as it may cause the SCL pin the SDA pin to be released after about
one machine cycle. Also, do not execute an instruction to set the
MST and TRX bits to “0” from “1” when the PIN bit is “1,” as it may
cause the same problem.
(6) Process after STOP condition generation
Do not write data in the I2C data shift register S0 and the I2C status
register S1 until the bus busy flag BB becomes “0” after generating
the STOP condition in the master mode. Doing so may cause the
STOP condition waveform from being generated normally. Reading
the registers does not cause the same problem.


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