UPD72042BGT NEC [NEC], UPD72042BGT Datasheet - Page 51

• Manufacturer Part Number: UPD72042BGT
• Description: LSI DEVICE FOR Inter Equipment Bus (IEBus) PROTOCOL CONTROL
• Manufacturer: NEC [NEC]

0100
0101
0110
0111
Note See Note of Table 4-9.
(b) Slave reception
SLRC
Slave reception is performed when the broadcast bit is set to 1, and a communication frame with the local
station address specified in the slave address field is received.
Table 4-7 indicates the SLRC return codes for slave reception.
1. Meaning: Slave reception is started.
2. Occurrence condition:
3. Microcomputer processing: Three-byte data consisting of a master address, control bits, and data-
1. Meaning: The slave reception buffer is full.
2. Occurrence condition: This return code is issued when RBF becomes full during data reception as a
3. Microcomputer processing: If data consisting of one or more bytes is not read from RBF within the
1. Meaning: Slave reception was terminated normally.
2. Occurrence condition: This return code is issued when as much data as the amount specified in the
3. Microcomputer processing: Reception data can be read from RBF, and the number of bytes of slave
1. Meaning: Slave reception was aborted.
2. Occurrence condition: This return code is issued when reception is terminated prior to the reception
3. Microcomputer processing: Reception data can be read from RBF, and the number of bytes of slave
master unit.
After the data-length field, 0100 is set in SLRC, and three-byte data consisting of a master address,
control bits, and data-length bits is set in RBF.
length bits can be read from RBF.
slave unit, and reception data cannot be set in RBF.
period indicated below, the one-byte data cannot be received, and the PD72042B returns an NAK.
• Reception data read time:
data-length field has been received normally in a communication frame. In this case, the SLRE flag of
the FLG register changes from 1 to 0.
reception data can be read from RDR2.
of as much data as the amount specified in the data-length field of a communication frame. In this
case, the SLRE flag of the FLG register changes from 1 to 0.
reception data can be read from RDR2.
1 A separate communication frame up to the data-length field was received normally from the
2 Once the control field has been received, RBF is ready for reception
Table 4-7 SLRC Return Codes for Slave Reception
Data Sheet S13990EJ3V0DS
Approx. 1570 s (mode 0)
Approx. 390 s (mode 1)
Description
Note
.
PD72042B
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