Understand the design and operation of the SCI and the I 2 C, IrDA and Smart Card interfaces
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1 Module Introduction Purpose This training module provides an overview of the serial communication interface (SCI), I 2 C interface, IrDA interface and Smart Card interface built into H8S series MCUs. Objective Understand the design and operation of the SCI and the I 2 C, IrDA and Smart Card interfaces Content 25 pages 4 questions Learning Time 35 minutes 1
2 Serial Communication Interface Choice of Asynchronous or Synchronous interface Full-duplex communication Simultaneous transmission and reception On-chip baud rate generator Allows selection of desired bit rates Choice of internal or external clock as transmit/receive clock source Four interrupt sources tx_end, tx_empty, rx_full, error (overrun_err, framing_err, parity_err) 2
3 SCI Circuit 3
4 SCI Asynchronous Mode 4
5 Asynchronous Operation After transmission of a Byte is completed: 1) Data in TDR (next byte) transfers to TSR 2) Set Transmit Data Register Empty (TDRE) bit and generate TXI interrupt if Transmit interrupt is enabled After reception of a Byte is completed: 1) Received Data transfers from RSR to RDR 2) Set Receive Data Register Full (RDRF) bit and generate RXI interrupt if Receive interrupt is enabled 5
6 SCI Synchronous Mode Transmit: synchronous with falling edges Receive: synchronous with rising edges 6
7 Synchronous Communication The synchronization clock is output from Master side Slave cannot send data until 1) TDRE is set to 0 2) Clock has been received 7
8
9 I 2 C Bus Interface Provides a subset of the Philips I 2 C bus interface specification Facilitates design of multi-processor systems Meets all I 2 C physical layer requirements for PC and server system designs Is supported by Renesas software for reading and writing an I 2 C serial EEPROM Contact: techsupport@renesas.com or visit: 9
10 I 2 C Bus Hardware Design Highlights: Two-wire bidirectional bus Serial data line (SDA) Serial clock line (SCL) Open-collector output drivers Wired-AND connections Pull-up resistors Master and slave mode on each channel Addressing or non-addressing format Master SCL in SCL out SDA in SDA out Automatic generation of start and stop conditions in master mode SCL in SCL out SDA in SDA out VCC Slave SCL SDA 10
11 Fast, Double-Buffered Design SDA Data Register ICDR ICDRT ICDRR ICDRS Internal Data Bus Shift Register Noise Canceller 11
12 I 2 C Interface Features R S Address A Data Byte A Data Byte A / W 1 P From Master From Slave Start and Stop conditions generated automatically Receiver acknowledge handled automatically Slave Address Match interrupt Data Transfer End interrupt Arbitration Lost interrupt Stop Condition detection Clock-stretching 12
13 I 2 C Connection to EEPROM 13
14
15 IrDA Overview Excellent choice for short-distance wireless connectivity Fully compliant to the IrDA version 1.10 specification Enabled by setting bit IrE in register KBCOMP Transfer rate started at 9600bps TxD2/IrTxD Pulse Encoder TxD SCI2 RxD2/IrRxD Pulse Decoder RxD KBCOMP IrDA Function Block Diagram 15
16 IrDA Transmit/Receive Operations 16
17 IrDA Based Applications Computers/Peripherals PDA communication (business card transfer), laptop-printer (walkup printing), laptop- PC (file transfer), PC- whiteboard (ink capture), PC-watch (schedule download), laptop PC-LAN (network connection) Telephony PDA - telephone (auto dial), laptop PC-telephone (modem hookup), PC/laptop-cellular phone/pager (message download) Multimedia Laptop/PC-TV (video conferencing), camera-pc/printer (photo printing) Automotive Handheld devices/phones-automotive systems (diagnostics, auto rental), toll taking Consumer Remote controls for TV, stereos, PCs, etc., notebook PCs, set-top boxes (software downloads) Medical/Industrial Handheld devices and medical equipment (data collection, programming, diagnostics) 17
18
19 Smart Card Interface Many H8S MCUs support a Smart Card interface Interface is fully compliant to ISO/IEC specification A single line handles both transmission and reception TxD RxD SCK Rx(port) I/O CLK RST Smart Card 19
20 Smart Card Data Format 20
21 Smart Card I/F: Data Receive Receive Data Sampling Timing in Smart Card Mode 21
22 Smart Card I/F: Data Transmit 22
23 Smart Card Applications Smart Card 23
24
25 Module Summary Serial Communication Interface I 2 C Bus interface IrDA Bus interface Smart Card interface To get detailed information about all MCU solutions from Renesas including H8S MCUs. Please visit our website: 25
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