Renesas M16C Series User Manual page 98

M30240 Group
UARTi (i = 0 to 2) has two operation modes: a clock synchronous serial I/O mode and a clock
asynchronous serial I/O mode (UART mode). The contents of the serial I/O mode select bits (bits 0 to 2
at addresses 03A0
serial I/O or as a UART. Although a few functions are different, UART0 and UART1 have almost the
same functions.
UART0 through UART2 are almost equal in their functions with minor exceptions.Table 1.24 shows the
comparison of functions of UART0 through UART2, and Figure 1.76, Figure 1.77, Figure 1.78, Figure
1.79, and Figure 1.80 show the registers related to UARTi.
Table 1.24: Comparison of functions of UART0 through UART2
Function
CLK polarity selection
LSB first / MSB first selection
Continuous receive mode selection
Transfer clock output from multiple pins selection
Serial data logic switch
Sleep mode selection
TxD, RxD I/O polarity switch
TxD, RxD port output format
Parity error signal output
Bus collision detection
Note 1: Only during clock synchronous serial I/O mode.
Note 2: Only during clock synchronous serial I/O mode and 8-bit UART mode.
Note 3: Only during UART mode.
Note 4: Used for SIM interface.
Rev.1.00 Sep 24, 2003 Page 80 of 360
, 03A8 and 0378 ) determine whether UARTi is used as a clock synchronous
16 16 16
UART0
Possible (Note 1) Possible (Note 1)
Possible (Note 1) Possible (Note 1)
Possible (Note 1) Possible (Note 1)
Impossible Possible (Note 1)
Impossible Impossible
Possible (Note 3) Possible (Note 3)
Impossible Impossible
CMOS output CMOS output
Impossible Impossible
Impossible Impossible
UART0 to UART2
UART1 UART2
Possible (Note 1)
Possible (Note 2)
Possible (Note 1)
Impossible
Possible (Note 4)
Impossible
Possible
CMOS output
Possible (Note 4)
Possible