HD64F2636F20 Datasheet, PDF (622/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

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 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, when this bit is written to in reception the transmission acknowledge data setting is
overwritten regardless of the value of TRS. The value loaded from the reception device is
maintained unchanged, so caution is necessary when using bit operation instructions to overwrite
this register.
Bit 0
ACKB
0
1
Description
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)
Receive mode: 1 is output at acknowledge output timing
Transmit mode: Indicates that the receiving device has not acknowledged the data
(signal is 1)
Page 572 of 1458
REJ09B0103-0800 Rev. 8.00
May 28, 2010