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Renesas M16C/20 1.7 Precautions for Serial I/O (UART Mode) 1.7.1 Special Mode 2 , 1.7.2 Special Mode 4 (SIM Mode)

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M16C/26 Group

Rev.0.90 2003.12.28 page 18 of 28

Under development

Preliminary specification

Specifications in this manual are tentative and subject to change.

1.7 Precautions for Serial I/O (UART Mode)

1.7 Precautions for Serial I/O (UART Mode)

1.7.1 Special Mode 2 _______ _____

If a low-level signal is applied to the P85/NMI/SD pin when the TB2SC register IVPCR1 bit = 1 (three-

_____ _________

phase output forcible cutoff by input on SD pin enabled), the RTS2 and CLK2 pins go to a high-impedance

state.

1.7.2 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. Therefore, when using SIM mode, be

sure to clear the IR bit to “0” (no interrupt request) after setting these bits.

Contents

Main M16C/26 Group Keep safety first in your circuit designs! Notes regarding these materials Page Table of contents A-2 2. Differences Made Depending on Manufactured Time...............................25 1. Usage Precaution 1.1 Precautions for Power Control 1.2 Precautions for Protect 1.3 Precautions for Interrupts 1.3.1 Reading address 00000 1.3.2 Setting the SP 1.3.3 The NMI Interrupt 1.3.5 INT Interrupt 1.3.4 Changing the Interrupt Generate Factor 1.3.6 Rewrite the Interrupt Control Register Example 2:Using the dummy read to keep the FSET instruction waiting Example 3:Using the POPC instruction to changing the I flag Page 1.4 Precautions for DMAC 1.4.1 Write to DMAE Bit in DMiCON Register 1.5 Precautions for Timers 1.5.1 Timer A Page Page Page 1.5.2 Timer B Page Page 1.6 Precautions for Serial I/O (Clock-synchronous Serial I/O) 1.6.1 Transmission/reception 1.6.2 Transmission 1.6.3 Reception 1.7 Precautions for Serial I/O (UART Mode) 1.7.1 Special Mode 2 1.7.2 Special Mode 4 (SIM Mode) 1.8 Precautions for A-D Converter Microcomputer Page 1.9 Precautions for Programmable I/O Ports 1.10.2 Precautions for Stop mode 1.10.4 1.10.3 Precautions for Wait mode Precautions for Low power dissipation mode, ring oscillator low power dissipation mode 1.10.5 Writing command and data 1.10.7 Operation speed 1.10.8 Instructions inhibited against use 1.10.9 Interrupts 1.10.10 How to access 1.10.11 Writing in the user ROM area 1.10.12 DMA transfer 1.10.13 Regarding Programming/Erasure Times and Execution Time 1.10.15 1.10.14 Definition of Programming/Erasure Times Flash Memory Version Electrical Characteristics 10,000 E/W cycle products (D7, D9, U7, U9)