UPD72042BGT NEC [NEC], UPD72042BGT Datasheet - Page 68

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

68
6.1 COMMUNICATION FLAGS
to the registers of the PD72042B.
RAWF
TRRQ
TRCF
I
RERQ
RECF
SIZE
PW
PR
J
MCRQ
SDRQ
CORQ
MTRQF
MRRQF
STRQF
SLREF
• Buffer configuration
Remark Buffers pointed to by the write pointer (PW)
Table 6-1 lists the communication flags used in the main and interrupt routines, excluding those flags assigned
Note RERQ, RECF, and SIZE are stored in a buffer pair pointed to by PW and PR.
Note
Note
Note
Pointer
Note
Note
Name
0
1
Buffers pointed to by the read pointer (PR)
RERQ
Program crash detection flag (1: Detected, 0: Not detected)
Transmission processing request flag (1: Requested, 0: Not requested)
Transmission status (TRC stored)
Number of bytes in transmission data set in TBF
Reception processing request flag (1: Requested, 0: Not requested)
Reception status (REC stored)
Number of bytes in reception data which can be read from RBF (RDR1/RDR2 stored)
Write pointer for RERQ, RECF, and SIZE
Read pointer for RERQ, RECF, and SIZE
Number of bytes in reception data which has actually been read from RBF
Master communication processing request flag (1: Requested, 0: Not requested)
Slave data transmission processing request flag (1: Requested, 0: Not requested)
Command processing request flag (1: Requested, 0: Not requested)
Master transmission request flag (1: Requested, 0: Not requested)
Master reception request flag (1: Requested, 0: Not requested)
Slave data transmission request flag (1: Requested, 0: Not requested)
Slave broadcast reception enable flag (1: Enabled, 0: Disabled)
RECF
Table 6-1 Communication Flags
Data Sheet S13990EJ3V0DS
SIZE
Description
: RERQ
: RERQ
W
R
, RECF
, RECF
R
W
, and SIZE
, and SIZE
R
W
PD72042B