Renesas Asynchronous SH7145F Manuel d'utilisateur télécharger pdf (Page 3)

SH7145 Group

SCI Break Detection

REJ06B0384-0100Z/Rev.1.00 September 2004 Page 3 of 20

2. Description of Functions

In this sample task, the SCI (Serial Communication Interface) and CMT (Compare-Match Timer) are used.

2.1 Serial Communication Interface (SCI)

In this sample task, the SCI is used to perform asynchronous serial data communication. Figure 2 is the block diagram

of SCI module channel 0 (ch0); below, functions are explained referring to figure 2.

Baud rate generator

SCI0 clock

input/output pin

(SCK0)

SCI0 transmission

data output pin

(TXD0)

SCI0 reception

data input pin

(RXD0)

External

clock

Clock

Internal

peripheral

clocks

Pφ/128

Pφ/32

Pφ/8

Pφ/1

Interrupt

requests

TEI_0

TXI_0

RXI_0

ERI_0

Bit rate register_0

(BRR_0)

Serial mode register_0

(SMR_0)

Receive shift register_0

(RSR_0)

Receive data register_0

(RDR_0)

Serial control register_0

(SCR_0)

Serial status register_0

(SSR_0)

Serial direction control_0 register

(SDCR_0)

Transmission/

reception

control circuit

< SCI0 asynchronous serial transfer function block>

< Transfer rate generation >

< Transmission data control >

< Reception data control >

< Transmission/reception operation control settings >

Transmit shift register_0

(TSR_0)

Transmit data register_0

(TDR_0)

Figure 2 Block Diagram of SCI (ch0)

1 2 3 4 5 6 7 8 ... 19 20

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Renesas Asynchronous SH7145F Manuel d'utilisateur Page 3

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