Renesas Asynchronous SH7145F Manual de usuario descargar pdf (Pagina 2)

SH7145F

Multiprocessor Communications

REJ06B0358-0100O/Rev.1.00 March 2004 Page 2 of 17

1. Specifications

As shown in figure 1, asynchronous multiprocessor communication is performed using channel 0

(ch0) of the SCI module of the SH7145F.

Multiprocessor communication allows data to be sent to multiple user-defined receiver stations by

preceding the data with a specific receiver station ID. Each receiver station first checks the ID sent

to it against its own ID. If they match, it receives the data that follows. The data that follows is not

received if the IDs do not match.

In this task example serial data is transmitted from the SH7145 to user-defined receiver stations.

The communication format is 192,000 bps, 8-bit, one stop bit, and no parity.

SH7145

Receiver

station A

Receiver

station B

TXD

RXD

SCI

(ch0)

3.3 V Vc

RXD

Vcc

Figure 1 Asynchronous Serial Data Transmission by SH7145

Table 1 Asynchronous Multiprocessor Communications Format

Format Item Setting

Bit rate 19200 bps

Data length 8 bits

Parity bit No

Stop bit 1 bit

Serial/parallel conversion format LSB first

1 2 3 4 5 6 7 ... 16 17

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Renesas Asynchronous SH7145F Manual de usuario Pagina 2