M30240ECFP MITSUBISHI [Mitsubishi Electric Semiconductor], M30240ECFP Datasheet - Page 102

• Manufacturer Part Number: M30240ECFP
• Description: M30240 Group Specification
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Specifications in this manual are tentative and subject to change
UART0 through UART2
Figure 1.92: Detection timing of a bus collision (in UART mode)
2.23.2.3 TxD, RxD I/O polarity reverse function (UART2)
2.23.2.4 Bus collision detection function (UART2)
interrupt request signal
Bus collision detection
Bus collision detection
This function is to reverse TxD pin output and RxD pin input. The level of any data to be input or output (in-
cluding the start bit, stop bit(s), and parity bit) is reversed. Set this function to “0” (not to reverse) for usual use.
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 1.92 shows the ex-
ample of detection timing of a buss collision (in UART mode).
interrupt request bit
Transfer clock
RxD
TxD
2
2
“H”
“H”
“H”
“1”
“0”
“L”
“L”
“L”
“1”
“0”
ST
ST
1-102
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Mitsubishi microcomputers
M30240 Group
SP
SP
ST : Start bit
SP : Stop bit