M16C62P_06 Datasheet, PDF (389/421 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

M16C/62P Group (M16C/62P, M16C/62PT)
24. Precautions
24.10.2 UART
24.10.2.1 Special Mode 1(I²C Mode)
When generating start, stop and restart conditions, set the STSPSEL bit in the UiSMR4 register to “0” and wait
for more than half cycle of the transfer clock before setting each condition generate bit (STAREQ, RSTAREQ
and STPREQ) from “0” to “1”.
24.10.2.2 Special Mode 2
If a low-level signal is applied to the NMI pin when the IVPCR1 bit in the TB2SC register = 1 (three-phase
output forcible cutoff by input on NMI pin enabled), the RTS2 and CLK2 pins go to a high-impedance state.
24.10.2.3 Special Mode 4 (SIM Mode)
A transmit interrupt request is generated by setting the U2C1 register U2IRS bit to “1” (transmission complete)
and U2ERE bit to “1” (error signal output) after reset is deasserted. Therefore, when using SIM mode, be sure
to clear the IR bit to “0” (no interrupt request) after setting these bits.
24.10.3 SI/O3, SI/O4
The SOUTi default value which is set to the SOUTi pin by the SMi7 bit approximately 10ns may be output
when changing the SMi3 bit from “0” (I/O port) to “1” (SOUTi output and CLK function) while the SMi2 bit in
the SiC (i=3 and 4) to “0” (SOUTi output) and the SMi6 bit is set to “1” (internal clock). And then the SOUTi
pin is held high-impedance.
If the level which is output from the SOUTi pin is a problem when changing the SMi3 bit from “0” to “1”, set
the default value of the SOUTi pin by the SMi7 bit.
Rev.2.41 Jan 10, 2006 Page 374 of 390
REJ09B0185-0241