M306V5EESP Mitsubishi, M306V5EESP Datasheet - Page 112

• Manufacturer Part Number: M306V5EESP
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

112
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)
RxD
CLK
TxD
CLK
TxD
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 signal
Bus collision detection
Bus collision detection
interrupt request bit
Enabling transmission
Transfer clock
RxD
TxD
2
" selected
2
2
“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
M306V5ME-XXXSP
M306V5EESP
SP
SP
ST : Start bit
SP : Stop bit
Rev. 1.0