H8SSLASH2224 datasheet(601/1071 Pages) RENESAS

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

Rev. 5.00 Aug 08, 2006 page 515 of 982

REJ09B0054-0500

14.3.18 IEBus Transmit/Runaway Status Register (IETSR)

IETSR detects transmit data ready, transmit start, transmit normal completion, transmit completion

with an error, or runaway states. Each status flags in IETSR corresponds to a bit in the IEBus

transmit/runaway interrupt enable register (IEIET) that enables or disables each interrupt.

Bit

Bit Name

Initial

Value

R/W

Description

TxRDY

R/W

Transmit Data Ready

Indicates that the next data can be written to IETBR since

IETBR is empty. This flag is automatically cleared by DTC*

data transfer. When data is transmitted by the CPU, this

flag must be cleared by software. This flag is cleared by

writing 0 after reading a 1 from this flag.

[Setting conditions]

• Immediately after reset

• When data can be written to IETBR (: When IEB has

loaded data from IETBR to the transmit shift register)

[Clearing conditions]

• When writing 0 after reading TxRDY = 1

• When data is written to TBR by the DTC by a TxRDY

request.

Note: This flag is not cleared on the end byte of DTC

transfer.

6 to 4



All 0



Reserved

These bits are always read as 0 and cannot be modified.

IRA

R/W

IEBus Runaway State

Indicates that the on-chip microprogram for IEBus control is

in the runaway states. This flag is set to 1 when a runaway

occurs during either IEBus transmission or reception. (This

flag is not a transfer specific flag and is also set for a

reception runaway.)

[Setting condition]

When the on-chip microprogram is in the runaway states

[Clearing condition]

When writing 0 after reading IRA = 1

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