H8SSLASH2225 datasheet(619/1071 Pages) RENESAS

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Section 14 IEBus™ Controller (IEB) [H8S/2258 Group]

Rev. 5.00 Aug 08, 2006 page 533 of 982

REJ09B0054-0500

Dn-1

IECTR

RSS

RE, DEE

CMX

MRQ

SRQ

SRE

RxRDY

RxS

RxF

RxE

IEMA1

IEMA2

IEFLG

IERSR

Slave reception

Broadcast reception

H: Header, MA: Master address field, SA: Slave address field,

CF: Control field, LF: Message length field, D1, D2,..., Dn-1, Dn: Data field

Broadcast reception is performed while the DEE bit is set to 1.

The RxRDY flag has not been cleared when the control field is received.

Set the RxE flag and the master unit address in IEMA1 and IEMA2.

Lower 4 bits of the master address

Upper 8 bits of the master address

Figure 14.10 Error Occurrence in the Broadcast Reception (DEE = 1)

14.4.3

Master Reception

This section shows an example of performing a master reception using the DTC after slave

reception.

(1) IEB Initialization

(a) Setting the IEBus Control Register (IECTR)

Enable the IEBus pins, select the signal polarity, and select a clock supplied to the IEB. Set the

RE bit to 1 to perform reception. The LUEE bit does not need to be specified.

(b) Setting the IEBus Master Unit Address Registers 1 and 2 (IEAR1 and IEAR2)

Specify the master unit address and specify the communications mode in IEAR1. Compare

with the slave address in the communications frame and receive the frame if matched.

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