PD72042B_15 Datasheet, PDF (52/92 Pages) Renesas Technology Corp – LSI DEVICE FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL

µPD72042B
[SLRC]
SLRC indicates the communication status for slave data transmission, slave reception, or broadcast reception.
(a) Slave data transmission
Slave data transmission is performed when the microcomputer makes the setting described below.
• Slave data transmission setting
In COMC of the CMR register, a command (1011 or 1100) for requesting slave data transmission is set
from the microcomputer.
SLRC
0000
0001
0010
0011
Table 4-6 SLRC Return Codes in Slave Data Transmission
Description
1. Meaning: Slave data transmission has been started.
2. Occurrence condition: This return code is issued when the control bits (0011 or 0111) requesting data
transmission are received from the master unit.
1. Meaning: Slave transmission data is not available.
2. Occurrence condition: This return code is issued when the next transmission data is not set in TBF
during slave data transmission.
3. Microcomputer processing: If data consisting of one or more bytes is not set in TBF within the time
below, transmission may be terminated prior to its completion.
• Transmission data setting time: Approx. 1570 µs (mode 0)
Approx. 390 µs (mode 1)
1. Meaning: Slave data transmission was terminated normally.
2. Occurrence condition: This return code is issued when as much data as the amount specified in the
data-length field has been transmitted normally. In this case, the STRQ flag of the FLG register
changes from 1 to 0.
1. Meaning: Slave data transmission was aborted.
2. Occurrence condition: This return code is issued when communication is terminated prior to the
transmission of as much data as the amount specified in the data-length field in a communication frame.
In this case, the STRQ flag of the FLG register changes from 1 to 0.
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Data Sheet S13990EJ3V0DS