h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 612

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 I
Bit 3—Acknowledge Bit Judgement Selection (ACKE): Specifies whether the value of the
acknowledge bit returned from the receiving device when using the I
and continuous transfer is performed, or transfer is to be aborted and error handling, etc.,
performed if the acknowledge bit is 1. When the ACKE bit is 0, the value of the received
acknowledge bit is not indicated by the ACKB bit, which is always 0.
In this LSI, the DTC can be used to perform continuous transfer. The DTC is activated when the
IRTR interrupt flag is set to 1 (IRTR is one of two interrupt flags, the other being IRIC). When the
ACKE bit is 0, the TDRE, IRIC, and IRTR flags are set on completion of data transmission,
regardless of the value of the acknowledge bit. When the ACKE bit is 1, the TDRE, IRIC, and
IRTR flags are set on completion of data transmission when the acknowledge bit is 0, and the
IRIC flag alone is set on completion of data transmission when the acknowledge bit is 1.
When the DTC is activated, the TDRE, IRIC, and IRTR flags are cleared to 0 after the specified
number of data transfers have been executed. Consequently, interrupts are not generated during
continuous data transfer, but if data transmission is completed with a 1 acknowledge bit when the
ACKE bit is set to 1, the DTC is not activated and an interrupt is generated, if enabled.
Depending on the receiving device, the acknowledge bit may be significant, in indicating
completion of processing of the received data, for instance, or may be fixed at 1 and have no
significance.
Rev. 6.00 Feb 22, 2005 page 552 of 1484
REJ09B0103-0600
Bit 3
ACKE
0
1
Description
The value of the acknowledge bit is ignored, and continuous transfer is performed
If the acknowledge bit is 1, continuous transfer is interrupted
2
C Bus Interface [Option] (Only for the H8S/2638, H8S/2639, and H8S/2630)
2
C bus format is to be ignored
(Initial value)