M306V2 Mitsubishi, M306V2 Datasheet - Page 123

• Manufacturer Part Number: M306V2
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

Rev. 1.0
Figure 2.11.25 Detection timing of a bus collision (in UART mode)
Figure 2.11.26 Some other functions
Transmit start condition select bit (Bit 6 of the UART2 special mode register)
With "1: falling edge of RxD
0: In normal state
(4) Bus collision detection function and other functions (UART2)
interrupt request signal
Bus collision detection
RxD
CLK
TxD
CLK
TxD
Bus collision detection
This function is to sample the output level of the TxD pin and the input level of the RxD pin at the rising
edge of the transfer clock; if their values are different, then an interrupt request occurs. Figure 2.11.26
shows the example of detection timing of a buss collision (in UART mode).
And also, bit 5 of the special UART2 mode register is used as the selection bit for auto clear function
select bit of enable bit. Setting this bit to “1” automatically resets the transmit enable bit to “0” when “1”
is set in the bus collision detection interrupt request bit (nonconformity) (refer to Figure 2.11.25).
Bit 6 of the special UART2 mode register is used as the transmit start condition select bit. Setting this
bit to “1” starts the TxD transmission in synchronization with the falling edge of the RxD terminal (refer
to Figure 2.11.26).
interrupt request bit
Transfer clock
Enabling transmission
RxD
TxD
2
2
2
" selected
“H”
“H”
“H”
“1”
“0”
“L”
“L”
“L”
“1”
“0”
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
ST
ST
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M306V2ME-XXXFP
SP
SP
M306V2EEFP
ST : Start bit
SP : Stop bit
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