HD64F2636F20 Datasheet, PDF(612/1512 Page) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

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HD64F2636F20 Datasheet, PDF (612/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

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Section 15 I2C Bus Interface [Option]

(Only for the H8S/2638, H8S/2639, and H8S/2630)

H8S/2639, H8S/2638, H8S/2636,

H8S/2630, H8S/2635 Group

Bit 3âAcknowledge Bit Judgement Selection (ACKE): Specifies whether the value of the

acknowledge bit returned from the receiving device when using the I2C bus format is to be ignored

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.

Bit 3

ACKE

0

1

Description

The value of the acknowledge bit is ignored, and continuous transfer is performed

(Initial value)

If the acknowledge bit is 1, continuous transfer is interrupted

Page 562 of 1458

REJ09B0103-0800 Rev. 8.00

May 28, 2010

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