参数资料
型号: M30621FCAGP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP80
封装: 14 X 14 MM, 0.65 MM PITCH, PLASTIC, QFP-80
文件页数: 26/143页
文件大小: 3168K
代理商: M30621FCAGP
UART2 Special Mode Register
Mitsubishi microcomputers
M16C / 62A Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
118
1. Bus collision detect sampling clock select bit (Bit 4 of the UART2 special mode register)
0: Rising edges of the transfer clock
CLK
Timer A0
1: Timer A0 overflow
2. Auto clear function select bit of transmt enable bit (Bit 5 of the UART2 special mode register)
CLK
TxD/RxD
Bus collision
detect interrupt
request bit
Transmit
enable bit
3. Transmit start condition select bit (Bit 6 of the UART2 special mode register)
CLK
TxD
Enabling transmission
CLK
TxD
RxD
With "1: falling edge of RxD2" selected
0: In normal state
TxD/RxD
Figure 1.14.27. Some other functions added
Some other functions added are explained here. Figure 1.14.27 shows their workings.
Bit 4 of the UART2 special mode register is used as the bus collision detect sampling clock select bit. The
bus collision detect interrupt occurs when the RxD2 level and TxD2 level do not match, but the nonconfor-
mity is detected in synchronization with the rising edge of the transfer clock signal if the bit is set to “0”. If
this bit is set to “1”, the nonconformity is detected at the timing of the overflow of timer A0 rather than at
the rising edge of the transfer clock.
Bit 5 of the UART2 special mode register is used as the auto clear function select bit of transmit enable
bit. Setting this bit to “1” automatically resets the transmit enable bit to “0” when “1” is set in the bus
collision detect interrupt request bit (nonconformity).
Bit 6 of the UART2 special mode register is used as the transmit start condition select bit. Setting this bit
to “1” starts the TxD transmission in synchronization with the falling edge of the RxD terminal.
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