M30222 Datasheet, PDF (114/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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Specifications in this manual are tentative and subject to change
MITSUBISHI MICROCOMPUTERS
M30222 Group
Rev. G
Clock Synchronous Serial I/O Mode
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 1.35. Specifications of clock synchronous serial I/O mode (2)
Item
Select function
Specification
• CLK polarity selection
Whether transmit data is output/input at the rising edge or falling edge of the
transfer clock can be selected
• LSB first/MSB first selection
Whether transmission/reception begins with bit 0 or bit 7 can be selected
• Continuous receive mode selection
Reception is enabled simultaneously by a read from the receive buffer register
• Transfer clock output from multiple pins selection (UART1) (Note)
UART1 transfer clock can be chosen by software to be output from one of
the two pins set
• Separate CTS/RTS pins (UART0) (Note)
UART0 CTS and RTS pins each can be assigned to separate pins
• Switching serial data logic (UART2)
Whether to invert data in writing to the transmission buffer register or
reading the reception buffer register can be selected.
• TxD, RxD I/O polarity reverse (UART2)
This function is inverting TxD port output and RxD port input. All I/O data
level are inverted, including start and stop bits.
Note: The transfer clock output from multple pins and the separate CTS/RTS pins functions cannot be selected simultaneously.
UARTi transmit/receive mode registers
b7 b6 b5 b4 b3 b2 b1 b0
0
001
Symbol
UiMR(i=0,1)
Address
When reset
03A016, 03A816
0016
Bit symbol
Bit name
Function
SMD0
SMD1
SMD2
CKDIR
STPS
PRY
PRYE
SLEP
Serial I/O mode select bit
b2 b1 b0
0 0 1 : Clock synchronous serial
I/O mode
Internal/external clock
select bit
0 : Internal clock
1 : External clock (Note)
Invalid in clock synchronous serial I/O mode
0 (Must always be “0” in clock synchronous serial I/O mode)
Note: Set the corresponding port direction register to "0".
RW
UART2 transmit/receive mode register
b7 b6 b5 b4 b3 b2 b1 b0
0
001
Symbol
U2MR
Address
037816
When reset
0016
Bit symbol
Bit name
Function
SMD0
SMD1
SMD2
CKDIR
STPS
PRY
PRYE
Serial I/O mode select bit
b2 b1 b0
0 0 1 : Clock synchronous serial
I/O mode
Internal/external clock
select bit
0 : Internal clock
1 : External clock (Note 1)
Invalid in clock synchronous serial I/O mode
IOPOL
TxD, RxD I/O polarity
reverse bit (Note)
0 : No reverse (Note 2)
1 : Reverse
Note 1: Set the corresponding port direction register to "0".
Note 2: Usually set to "0".
RW
Fig. 1.87. UARTi transmit/receive mode register in clock synchronous serial I/O mode
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