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CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
449
10.3.3 Control registers
(1) Asynchronous serial interface mode registers 10, 20 (ASIM10, ASIM20)
The ASIMn0 register is an 8-bit register that controls the UART1, UART2 transfer operation (n = 1, 2).
This register can be read/written in 8-bit or 1-bit units.
Cautions 1. If the contents of the ASIMn0 register are changed during UARTn transmission or
reception, the UARTn operation cannot be guaranteed (n = 1, 2).
2. Set the ASIMn0 register when the UARTn operation is stopped (when RXEn bit = 0 and
transmission is completed). Do not change port 3 mode control register (PMC3) after
setting the ASIMn0 register.
3. In the case of serial clock output in the clocked (synchronous) mode, ensure that nodes
do not output to one another causing conflicts.
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