M30622 Mitsubishi, M30622 Datasheet - Page 134

• Manufacturer Part Number: M30622
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: Mitsubishi

Clock asynchronous serial I/O (UART) mode
Figure 1.19.20. Detection timing of a bus collision (in UART mode)
Figure 1.19.19. Timing for switching serial data logic, and I/O polarity reverse
(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 1.19.19 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. Figure 1.19.19 shows the example of timing for I/O polarity reverse.
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 1.19.20
shows the example of detection timing of a buss collision (in UART mode).
interrupt request signal
Bus collision detection
Tentative Specifications REV.A
Bus collision detection
interrupt request bit
S
No polarity reverse
No polarity reverse
No logic reverse
• When LSB first, parity enabled, one stop bit
Polarity reverse
pecifications in this manual are tentative and subject to change.
Transfer clock
No logic reverse
Polarity reverse
Logic reverse
Transfer clock
Logic reverse
TxD
TxD
TxD
TxD
2
2
2
RxD
TxD
2
2
2
“H”
“H”
“H”
“H”
“H”
“L”
“L”
“L”
“L”
“L”
“H”
“H”
“H”
“L”
“L”
“L”
“1”
“0”
“1”
“0”
X
D pin output and R
ST
ST
ST
ST
D0
D0
D0
D0
ST
ST
D1
D1
D1
D1
134
D2
D2
D2
D2
X
D pin input. The level of any data to be input or output
X
D pin and the input level of the R
D3
D3
D3
D3
16
) is assigned 1, data is inverted in writing to the
D4
D4
D4
D4
D5
D5
D5
D5
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
D6
D6
D6
D6
D7
D7
D7
D7
Mitsubishi microcomputers
ST : Start bit
P : Even parity
SP : Stop bit
P
P
P
P
M16C / 62T Group
SP
SP
X
D pin at the rising
SP
SP
SP
SP
ST : Start bit
SP : Stop bit