H8SSLASH2224 datasheet(766/1071 Pages) RENESAS

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Section 16 I

2C Bus Interface (IIC) (Option)

Rev. 5.00 Aug 08, 2006 page 680 of 982

REJ09B0054-0500

6. Value when the IICX bit is set to 1. When the IICX bit is cleared to 0, the value is 6tcyc.

7. The H8S/2258 Group is out of operation.

7. Note on ICDR Read at End of Master Reception

To halt reception after completion of a receive operation in master receive mode, set the TRS

bit to 1 and write 0 to BBSY and SCP in ICCR. This changes the SDA pin from low to high

when the SCL pin is high, and generates the stop condition. After this, receive data can be read

by means of an ICDR read, but if data remains in the buffer the ICDRS receive data will not be

transferred to ICDR, and so it will not be possible to read the second byte of data. If it is

necessary to read the second byte of data, issue the stop condition in master receive mode (i.e.

with the TRS bit cleared to 0). When reading the receive data, first confirm that the BBSY bit

in ICCR is cleared to 0, the stop condition has been generated, and the bus has been released,

then read ICDR with TRS cleared to 0. Note that if the receive data (ICDR data) is read in the

interval between execution of the instruction for issuance of the stop condition (writing of 0 to

BBSY and SCP in ICCR) and the actual generation of the stop condition, the clock may not be

output correctly in subsequent master transmission.

Clearing of the MST bit after completion of master transmission/reception, or other

modifications of IIC control bits to change the transmit/receive operating mode or settings,

must be carried out during interval (a) in figure 16.21 (after confirming that the BBSY bit has

been cleared to 0 in the ICCR register).

SDA

SCL

Internal clock

BBSY bit

Master receive mode

ICDR reading

prohibited

Bit 0

Stop condition

(a)

Start condition

Execution of stop

condition issuance

instruction

(0 written to BBSY

and SCP)

Confirmation of stop

condition generation

(0 read from BBSY)

Start condition

issuance

Figure 16.21 Points for Attention Concerning Reading of Master Receive Data

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