M16C26A Datasheet, PDF (331/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/26A Group (M16C/26A, M16C/26B, M16C/26T)
19. Usage Notes
19.8.2 Serial I/O (UART Mode)
19.8.1.1 Special Mode 1 (I²C bus Mode)
When generating start, stop and restart conditions, set the STSPSEL bit in the U2SMR4 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”.
19.8.1.2 Special Mode 2
_______ _____
If a low-level signal is applied to the P85/NMI/SD pin when the IVPCR1 bit in the TB2SC register is set
_____
to "1" (three-phase output forcible cutoff by input on SD pin enabled), the P73/RTS2/TxD1(when the
U1MAP bit in PACR register is “1”) and CLK2 pins go to a high-impedance state.
19.8.1.3 Special Mode 4 (SIM Mode)
A transmit interrupt request is generated by setting the U2IRS bit in the U2C1 register to “1” (transmis-
sion complete) and U2ERE bit to “1” (error signal output) after reset. Therefore, when using SIM
mode, be sure to clear the IR bit to “0” (no interrupt request) after setting these bits.
Rev. 2.00 Feb.15, 2007 ^{page 314} of 329
REJ09B0202-0200