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HD64F2149YV 데이터시트(PDF) 546 Page - Renesas Technology Corp

부품명 HD64F2149YV
상세설명  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
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Section 16 I
2C Bus Interface
Rev. 3.00 Jan 18, 2006 page 518 of 1044
REJ09B0280-0300
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.
When writing to this bit, acknowledge data that is returned after receiving is rewritten regardless
of the TRS value. The data loaded from receiving device is retained, therefore pay attention when
using bit-manipulation instructions.
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)



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