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PD72042B Datasheet(PDF) 40 Page - Renesas Technology Corp

Part No. PD72042B
Description  LSI DEVICE FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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PD72042B Datasheet(HTML) 40 Page - Renesas Technology Corp

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µPD72042B
38
Data Sheet S13990EJ3V0DS
TBF
Address
: 1110B (EH)
Read/write
: Write
Transmission buffer
When reset : Empty
TBF is a 33-byte FIFO buffer used to hold the number of bytes of transmission data and transmission data for master
transmission and slave data transmission.
TBF can be written from the microcomputer when the TFL flag of the STR register is set to 0 (indicating that TBF
is not full).
In master transmission and slave data transmission, the following format is used to load data into TBF from the
microcomputer.
Byte 1
Number of bytes of transmission data
Byte 2
First byte of transmission data
Byte 3
Second byte of transmission data
Byte 33
[Byte 1]: Number of bytes of transmission data
Between 1 and 256 bytes can be set.
[Bytes 2 and up]: Transmission data
As much transmission data as is set in byte 1 is set in byte 2 and subsequent bytes.
TBF
Number of bytes of
Data set in byte 1 of TBF
transmission data
1
01H
2
02H
255
FFH
256
00H


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