CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U15195EJ5V0UD
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10.3.3 Control registers
Because UART1 shares its pins with CSI1, the UART1 mode must be preset by using the PMC3 and RFC3
registers (refer to
10.1.1 Selecting UART1 or CSI1 mode
).
(1) Asynchronous serial interface mode register 10 (ASIM10)
The ASIM10 register is an 8-bit register that controls the UART1 transfer operation.
This register can be read/written in 8-bit or 1-bit units.
Cautions 1. If any bits other than the RXE1 bit of the ASIM10 register are changed during UART1
transmission or reception, the UART1 operation cannot be guaranteed.
2. Set bits other than the RXE1 bit of the ASIM10 register when the UART1 operation is
stopped (when RXE1 = 0 and transmission is completed). Change the port 3 mode
control register (PMC3) after setting the communication mode in the bits other than the
RXE1 bit of the ASIM10 register.
3. In the case of serial clock output in the clocked (synchronous) mode, ensure that nodes
do not output to one another causing conflict.
