M30622M4 MITSUBISHI [Mitsubishi Electric Semiconductor], M30622M4 Datasheet - Page 135

• Manufacturer Part Number: M30622M4
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Clock asynchronous serial I/O (UART) mode
Figure 1.19.20. Timing for switching serial data logic
Figure 1.19.21. Detection timing of a bus collision (in UART mode)
(c) Function for switching serial data logic (UART2)
(d) TxD, RxD I/O polarity reverse function (UART2)
(e) Bus collision detection function (UART2)
When the data logic select bit (bit 6 of address 037D
transmission buffer register or reading the reception buffer register. Figure 1.19.20 shows the ex-
ample of timing for switching serial data logic.
This function is to reverse T
(including 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 T
edge of the transfer clock; if their values are different, then an interrupt request occurs. Figure 1.19.21
shows the example of detection timing of a buss collision (in UART mode).
interrupt request signal
Bus collision detection
Bus collision detection
interrupt request bit
Transfer clock
• When LSB first, parity enabled, one stop bit
Transfer clock
(no reverse)
(reverse)
TxD
TxD
RxD
TxD
2
2
2
2
“H”
“H”
“H”
“L”
“L”
“L”
“H”
“H”
“H”
“L”
“L”
“L”
“1”
“0”
“1”
“0”
X
D pin output and R
ST
ST
D0
D0
ST
ST
D1
D1
D2
D2
X
D pin input. The level of any data to be input or output
X
D3
D3
D pin and the input level of the R
16
) is assigned 1, data is inverted in writing to the
D4
D4
D5
D5
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
D6
D6
D7
D7
ST : Start bit
P : Even parity
SP : Stop bit
P
P
SP
SP
Mitsubishi microcomputers
X
M16C / 62 Group
D pin at the rising
SP
SP
ST : Start bit
SP : Stop bit
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