UPD72042BGT NEC [NEC], UPD72042BGT Datasheet - Page 50

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

50
[SLRC]
0000
0001
0010
0011
SLRC indicates the communication status for slave data transmission, slave reception, or broadcast reception.
SLRC
(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.
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
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
3. Microcomputer processing: If data consisting of one or more bytes is not set in TBF within the time
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
1. Meaning: Slave data transmission was aborted.
2. Occurrence condition: This return code is issued when communication is terminated prior to the
transmission are received from the master unit.
during slave data transmission.
below, transmission may be terminated prior to its completion.
• Transmission data setting time: Approx. 1570 s (mode 0)
data-length field has been transmitted normally. In this case, the STRQ flag of the FLG register
changes from 1 to 0.
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.
Table 4-6 SLRC Return Codes in Slave Data Transmission
Data Sheet S13990EJ3V0DS
Approx. 390 s (mode 1)
Description
PD72042B