H8SSLASH2224 datasheet(706/1071 Pages) RENESAS

706 / 1071 page

Section 15 Serial Communication Interface (SCI)

Rev. 5.00 Aug 08, 2006 page 620 of 982

REJ09B0054-0500

15.8

SCI Select Function (H8S/2239 Group Only)

SCI_0 provides the SCI select function that enables one-to-one clocked synchronous

communication between a master LSI and multiple slave LSIs (these LSIs). Figure 15.36 shows an

example of communication using the SCI select function and figure 15.37 shows the summary of

its operation.

The master LSI enables to communicate with the slave LSI_A by setting the

SEL_A signal to low

and the

SEL_B signal to high. In this case, the TxD0_B pin of the slave LSI_B becomes Hi-Z and

that fixes the on-chip SCK0_B signal high, causing the communication terminated. To

communicate with the slave LSI_B, set the

SEL_A signal to high and the SEL_B signal to low.*

The slave LSI detects its being selected by the low input interrupt of

IRQ7 and handles data

transferring smoothly.

Note: * Change the select signal of the master LSI (

SEL_A or SEL_B) while the serial clock

(M_SCK) is high after the last bit of the transmit data has been output. In addition, set

only one select signal to low at a time.

Interrupt

controller

TSR0_A

RSR0_A

Transfer

control

Slave LSI_A (this LSI)

Master LSI

SCK0_A

C/A = CKE1 = SSE = 1

Slave LSI_B (this LSI)

SEL_A

IRQ7

SEL_B

M_TxD

RxD0

TxD0

RxD0

TxD0

SCK0

M_RxD

M_SCK

Figure 15.36 Example of Communication Using SCI Select Function

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