dp8344b National Semiconductor Corporation, dp8344b Datasheet - Page 175

• Manufacturer Part Number: dp8344b
• Description: Biphase Communications Processor?bcp
• Manufacturer: National Semiconductor Corporation

Transceiver LOOP
Control
Timer
6 0 Reference Section
6 2 3 Bit Definition Tables (Continued)
The following tables describe the location and function of all control and status bits in the various BCP addressable special
function registers The Remote Interface Configuration register
included
6 2 3 1 Processor (Continued)
6 2 3 2 Transceiver
Table includes control and status bits only It does not include definitions of bit fields provided for the formatting (de-formatting)
of data frames For further information see the Transceiver section
TLD
TM15 – 8
TM7 – 0
TMC
TO
TST
Bit
PS2 – 0
RTF7 – 0 Receive Transmit RTR 7 – 0
Bit
Timer LoaD
TiMer
TiMer
Timer Clock
select
Time Out flag
Timer StarT
internal
LOOP-back
Protocol Select
FIFOs
Name
Name
ACR 6
TRH 7 – 0
TRL 7 – 0
ACR 5
CCR 7
ACR 7
(Continued)
Location
TMR 6
TMR 2 – 0
Location
Reset State
XXXX XXXX
XXXX XXXX
Reset State
XXXX XXXX Input output port of the least significant 8 bits of receive and
0
0
0
0
000
0
175
RIC
When high TX-ACT is disabled (held at 0) and transmitter
serial data is internally directed to the receiver serial data
input
Selects protocol for both transmitter and receiver
transmit FIFOs OWP
onto the transmit FIFO on moves to RTR
Set high to load timer Cleared automatically when load
complete
Input output port of high byte of timer
Input output port of low byte of timer
Selects timer clock frequency Must not be written when
Set high when timer counts down to zero Cleared by writing
a 1 to TO or by stopping the timer (by writing a 0 to TST )
When high timer is enabled and will count down from its
current value Timer is stopped by writing a 0 to this location
RTF7 – 0 are popped from receive FIFO on moves from
TST high Can be written at same time as TST and
TLD
RTR
which is addressable only by a remote processor is not
PS2 – 0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
TMC Timer Clock
0
1
TF10 – 8 and RTF7 – 0 are pushed
Function
Function
3270
3299 Multiplexer
3299 Controller
3299 Repeater
5250
5250 Promiscuous
8-bit
8-bit Promiscuous
CPU-CLK 16
CPU-CLK 2
Protocol
RF10 – 8 and