No. 5966-10/24
LC74793, 74793JM
Command 2 (VPS/PDC control command 2)
First byte
DA 0 to 7
Register
Contents
Notes
Status
Function
7
—
1
First byte identification bit
6
—
1
Command 2 identification code.
5
—
1
VPS/PDC control settings 2.
4
—
1
3
—
0
2
—
0
1
—
1
0
—
0
Second byte
DA 0 to 7
Register
Contents
Notes
Status
Function
7
—
0
Second byte identification bit
6
VMWSE2
0
From the vertical mask period start return period
CPOUT pin vertical mask period
1
From 10H before the vertical mask period start return period
switching 2
5
VMWSEL
0
The vertical mask period is the return period
CPOUT pin vertical mask period
1
The vertical mask period is 9H
switching
4
HBS2
0
Clock run discrimination 1 (2 times)
Clock run discrimination circuit setting
1
Clock run discrimination 2 (4 times)
3
HBS1
0
Framing code discrimination 1
Framing code discrimination selection
1
Framing code discrimination 2 (A single bad bit is ignored)
0
Error check enabled (The error check can be turned on or off on
2
BMS
per-byte basis.)
1
Error check disabled (Applications can select whether data with errors
is held or written for each byte.)
1
EMS
0
Data hold
1
Data write (Error bits are set to 0 in VPS mode)
Error check turned on for unused bytes
0
VPS: bytes 3, 4, and 6 to 10, PDC: bytes 7 to 12
Header 1: bytes 14 to 37, 2: 14 to 29, 3 14 to 21.
0
DCE
Status 1 (3): bytes 7 to 25, status 2 (4) bytes 7 to 35.
Error check turned off for unused bytes
1
VPS: bytes 3, 4, and 6 to 10, PDC: bytes 7 to 12
Header 1: bytes 14 to 37, 2: 14 to 29, 3 14 to 21.
Status 1 (3): bytes 7 to 25, status 2 (4) bytes 7 to 35.
When set to 0: If there are no errors in bytes
for which the error check is turned on, those
bytes will be written to P-S (COM7-9).
When set to 1: Data is written to P-S
regardless of whether or not errors occurred.
When error checking is enabled, specifies the
processing when an error occurs in a byte for
which error checking was turned off
Error check setting for unused data
bytes
Biphase (VPS),
Hamming (PDC),
Odd parity (header)
Note: All registers are cleared to 0 when the IC is reset by the RST pin.