H8SSLASH2218 datasheet(486/750 Pages) RENESAS

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Section 12 Serial Communication Interface

Rev.6.00 Jun. 03, 2008 Page 438 of 698

REJ09B0074-0600

12.8

SCI Select Function (Clocked Synchronous Mode)

The SCI_0 supports the SCI select function which allows clock synchronous communication

between master LSI and one of multiple slave LSI. Figure 12.36 shows an example of

communication using the SCI select function. Figure 12.37 shows the operation.

The master LSI can communicate with slave LSI_A by bringing

SEL_A and SEL_B signals low

and high, respectively. In this case, the TxD0_B pin of the slave LSI_B is brought high-

impedance state and the internal SCK0_A signal is fixed high. This halts the communication

operation of slave LSI_B. The master LSI can communicate with slave LSI_B by bringing the

SEL_A and SEL_B signals high and low, respectively.

The slave LSI detects the selection by receiving the low level input from the

IRQ7 pin and

immediately executes data transmission/reception processing.

Note:

The selection signals (

SEL_A and SEL_B) of the LSI must be switched while the serial

clock (M_SCK) is high after the end bit of the transmit data has been send. Note that one

selection signal can be brought low at the same time.

Interrupt

controller

TSR0_A

RSR0_A

Transmission/

reception

control

Slave LSI_A (This LSI)

Master LSI

SCK0_A

SCK0_B

C/A = CKE1 = SSE = 1

Slave LSI_B (This LSI)

SEL_A

IRQ7_A

IRQ7_B

SEL_B

M_TxD

RxD0_A

TxD0_A

RxD0_B

TxD0_B

SCK0

M_RxD

M_SCK

Figure 12.36 Example of Communication Using the SCI Select Function

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