dp8344b National Semiconductor Corporation, dp8344b Datasheet - Page 166

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

6 0 Reference Section
DCR DEVICE CONTROL REGISTER
CCS
TCS1 0
IW1 0
DW2 – 0
Alternate R0 read write
CCS
7
TCS1 TCS0
6
CPU Clock Select
quency OCLK represents the frequency of the
on-chip oscillator or the externally applied clock
on input X1
Transceiver Clock Select
ceiver clock TCLK frequency
OCLK represents the frequency of the on-chip
oscillator or the externally applied clock on in-
put X1 X-TCLK is the external transceiver
clock input
Instruction memory Wait-state select
Selects from 0 to 3 wait states for accessing
instruction memory
Data memory Wait-state select
from 0 to 7 wait states for accessing data mem-
ory
5
TCS1 0
CCS
0
1
0 0
0 1
1 0
1 1
IW1
4
CPU CLK
OCLK
OCLK 2
OCLK
OCLK 2
OCLK 4
X-TCLK
IW0
TCLK
3
Selects CPU clock fre-
(Continued)
DW2
2
Selects trans-
DW1
1
Selects
DW0
0
166
DS DATA STACK
DS7 – 0
rsv
Main R31 read write
DS7
7
state is undefined at all times
DS6
6
Data Stack
Stack is 16 bytes deep Further information
Section 2 1 1 8 Stack Registers
DS5
5
DS4
4
Data stack input output port
DS3
3
DS2
2
DS1
1
DS0
0