dp8344b National Semiconductor Corporation, dp8344b Datasheet - Page 149

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

Figure 6-1
6 0 Reference Section
OR OR Immediate
Syntax
OR n rsd
Affected Flags
N Z
Description
Logically ORs the immediate value n to the register rsd and
places the result back into the register rsd Note that only
the active registers R0 – R15 may be specified for rsd The
value of n is 8 bits wide
Example
Mask both the Transmitter and Receiver interrupts via the
Interrupt Control Register ICR
rupts unaffected
Instruction Format
T-states
2
Bus Timing
Operation
rsd OR n
0
15
EXX 0 0
OR
Opcode
1
0
00000011B ICR
1
x
11
rsd
immediate limited register
select main reg banks
mask transmitter and
receiver interrupts
n
R2 Leave the other inter-
(Continued)
3
rsd
0
149
ORA OR with Accumulator
Syntax
ORA Rs Rd
ORA Rs mIr
Affected Flags
N Z
Description
Logically ORs the source register Rs to the active accumu-
lator and places the result into the destination specified
The destination may be either a register Rd or data memo-
ry via an index register mode mIr Note that register bank
selection determines which accumulator is active
Example
Write an 11-bit word to the Transmitter’s FIFO This exam-
ple assumes that the index register IZ points to the location
of the data in memory
Instruction Format
ORA Rs Rd
T-states
ORA Rs Rd
ORA Rs mIr
Bus Timing
ORA Rs Rd
ORA Rs mIr
Operation
ORA Rs Rd
Rs OR accumulator
ORA Rs mIr
Rs OR accumulator
ORA Rs mIr
1
15
TCR settings
EXX
MOVE TCR settings A load accumulator w mask
MOVE
ORA
MOVE
1
Opcode
1
1 1
R20 TCR
IZ
IZ
1
a
a
0
R20
RTR
EQU 00101000B
1
x
x
9
Figure 6-1
Figure 6-7
register register
register indexed
2
3
Rd
data memory
select main A alt B
load bits 8 9
write bits 8 9 10 to TCR
push 11-bit word to FIFO
Rd
4
10
TL F 9336 – 11
Rs
0