M30218 Datasheet, PDF (101/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

Clock asynchronous serial I/O (UART) mode
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Example of receive timing when transfer data is 8 bits long (parity disabled, one stop bit)
BRGi's count
source
Receive
“1”
enable bit
“0”
RxDi
Start bit
Sampled “L”
Transfer clock
Receive
“1”
complete flag _{“0”}
“H”
RTSi
“L”
Receive interrupt “1”
request bit
“0”
Reception triggered when
transfer clock is genelated by
falling edge of start bit
D0
D1 D7
Receive data taken in
Stop bit
Transferred from UARTi receive register to
UARTi receive buffer register
Cleared to “0” by software, or when an interrupt request is accepted.
The above timing applies to the following settings :
• Parity is disabled.
• One stop bit.
• RTS function is selected.
Figure GA-13. Typical receive timing in UART mode
(a) Sleep mode (UART0, UART1)
This mode is used to transfer data between specific microcomputers among multiple microcomputers
connected using UARTi. The sleep mode is selected when the sleep select bit (bit 7 at addresses
03A016, 03A816) is set to “1” during reception. In this mode, the unit performs receive operation when
the MSB of the received data = “1” and does not perform receive operation when the MSB = “0”.
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