H8S2245 datasheet(19/818 Pages) RENESAS

19 / 818 page

Rev.3.00 Mar. 26, 2007 Page xix of xlii

REJ09B0355-0300

Item

Page Revision (See Manual for Details)

447

Note

* added to figure 12.10

[3] Serial transmission continuation procedure: ... Checking and

clearing of the TDRE flag is automatic when the DTC

* is

activated by a transmit data empty interrupt (TXI) request, and ...

12.3.3 Multiprocessor

Communication Function

Figure 12.10 Sample

Multiprocessor Serial

Transmission Flowchart

Note:

* The case, in which the DTC automatically clears the

TDRE flag, occurs only when DISEL in DTC is 0 with the transfer

counter not being 0. Therefore, the TDRE flag should be cleared

by CPU when DISEL is 1, or when DISEL is 0 with the transfer

counter being 0.

12.3.4 Operation in

Clocked Synchronous

Mode

Figure 12.16 Sample

Serial Transmission

Flowchart

456

Note

* added to figure 12.16

[3] Serial transmission continuation procedure: ... Checking and

clearing of the TDRE flag is automatic when the DTC

* is

activated by a transmit data empty interrupt (TXI) request, and ...

Note:

* The case, in which the DTC automatically clears the

TDRE flag, occurs only when DISEL in DTC is 0 with the transfer

counter not being 0. Therefore, the TDRE flag should be cleared

by CPU when DISEL is 1, or when DISEL is 0 with the transfer

counter being 0.

Figure 12.18 Sample

Serial Reception

Flowchart

459

Note

* added to figure 12.18

[5] Serial reception continuation procedure: ... RDRF flag is

cleared automatically when the DTC

* is activated by a receive

data full interrupt (RXI) request, and ...

Note:

* The case, in which the DTC automatically clears the

RDRF flag, occurs only when DISEL in DTC is 0 with the transfer

counter not being 0. Therefore, the RDRF flag should be cleared

by CPU when DISEL is 1, or when DISEL is 0 with the transfer

counter being 0.

Figure 12.20 Sample

Flowchart of

Simultaneous Serial

Transmit and Receive

Operations

461

Note

* added to figure 12.20

[5] Serial transmission/reception continuation procedure: ... Also

the RDRF flag is cleared automatically when the DTC

* is

activated by a receive data full interrupt (RXI) request, and ...

Notes: When switching from transmit or receive operation to ...

* The case, in which the DTC automatically clears the TDRE

flag or RDRF flag, occurs only when DISEL in the corresponding

DTC transfer is 0 with the transfer counter not being 0.

Therefore, the corresponding flag should be cleared by CPU

when DISEL in the corresponding DTC transfer is 1, or when

DISEL is 0 with the transfer counter being 0.

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