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SH7145F

Synchronous Serial Data Transmission

REJ06B0352-0100O/Rev.1.00 March 2004 Page 3 of 16

2. Functions Used

In this task example the SCI (Serial Communication Interface) is used to perform synchronous

serial data transmission. Figure 2 shows a block diagram of channel 0 (ch0) of the SCI module.

The functions of the elements shown in figure 2 are described below.

TEI_0

TXI_0

RXI_0

ERI_0

SCI0 clock I/O pin

(SCK0)

SCI0 transmit data

output pin

(TXD0)

SCI0 receive data

input pin

(RXD0)

SCI0 synchronous serial transfer function block

Baud rate generator

Bit rate register 0

(BRR_0)

Clock

Transmit/receive operation control settings

Transfer rate generator

Serial mode register 0

(SMR_0)

Serial control register 0

(SCR_0)

Serial status register 0

(SSR_0)

Serial direction control register 0

(SDCR_0)

Transmit/receive

control circuit

Interrupt

requests

Transmit data control

Transmit shift register 0

(TSR_0)

Transmit data register 0

(TDR_0)

Receive data control

Receive shift register 0

(RSR_0)

Receive data register 0

(RDR_0)

External

clock

Pφ/128

Pφ/32

Pφ/8

Pφ1

On-chip

peripheral cloc

Figure 2 SCI (ch0) Block Diagram

• Synchronous Mode

Data is transmitted and received in synchronization with clock pulses. The transfer data length

is fixed at 8 bits.

• On-Chip Peripheral Clock Pφ

This is the reference clock for operation of on-chip peripheral functions. The clock signal is

generated by a clock oscillator.

1 2 3 4 5 6 7 8 ... 15 16

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