Datasheet

Section 18 I

C Bus Interface [Option]

(This function is not available in the H8S/2695)

Page 862 of 1434 R01UH0166EJ0600 Rev. 6.00

Mar 02, 2011

H8S/2633 Group, H8S/2633 F-ZTAT

H8S/2633R F-ZTAT

, H8S/2695

Bit 0—Acknowledge Bit (ACKB): Stores acknowledge data. In transmit mode, after the

receiving device receives data, it returns acknowledge data, and this data is loaded into ACKB. In

receive mode, after data has been received, the acknowledge data set in this bit is sent to the

transmitting device.

When this bit is read, in transmission (when TRS = 1), the value loaded from the bus line

(returned by the receiving device) is read. In reception (when TRS = 0), the value set by internal

software is read.

In addition, writing to this bit overwrites the setting for acknowledge data sent when receiving

data, regardless of the TRS value. In this case the value loaded from the receive device is

maintained, so caution is necessary when using instructions that manipulate the bits in this

Bit 0

ACKB Description

0 Receive mode: 0 is output at acknowledge output timing (Initial value)

Transmit mode: Indicates that the receiving device has acknowledged the data (signal

is 0)

1 Receive mode: 1 is output at acknowledge output timing

Transmit mode: Indicates that the receiving device has not acknowledged the data

(signal is 1)