DP8344BV National Semiconductor, DP8344BV Datasheet - Page 141

• Manufacturer Part Number: DP8344BV
• Description: IC BIPHASE COMM PROCESSR 84-PLCC
• Manufacturer: National Semiconductor

Specifications of DP8344BV

• Processor Type: 8-Bit RISC
• Speed: 20MHz
• Voltage: 4.5 ~ 5.5V
• Mounting Type: Surface Mount
• Package / Case: 84-PLCC
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Mounting: Surface Mount
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Lead Free Status / Rohs Status: Not Compliant
• Other names: *DP8344BV

6 0 Reference Section
JMP Conditional Relative Jump
Jcc
Syntax
JMP f s n
Jcc
Affected Flags
None
Description
Conditionally transfers control to the instruction at the mem-
ory address calculated by adding the contents of the Pro-
gram Counter to the immediate value n (sign extended to
16 bits) if the state of the flag referenced by f is equal to the
state of the bit s or optionally if the condition cc is met
See the tables below for the flags that f can reference and
the conditions that cc may specify Since the immediate val-
ue n is an 8-bit two’s complement displacement the condi-
tional relative jump’s range is from
to the Program Counter Note that the Program Counter ini-
tially contains the memory address of the next instruction
following the jump
Example
This example demonstrates both syntaxes of the condition-
al relative jump instruction testing for a non-zero result from
a previous instruction (i e
met then control transfers to the instruction labeled
‘‘Loop back’’ else the next instruction following the jump is
executed
Z
NZ
EQ
NEQ
C
NC
V
NV
N
P
RA
NRA
RE
NRE
DA
NDA
TFF
NTFF Transmitter FIFO Not Full
JMP
JNZ
cc
n
Zero
Not Zero
Equal
Not Equal
Carry
No Carry
Overflow
No Overflow
Negative
Positive
Receiver Active
Not Receiver Active
Receiver Error
No Receiver Error
Data Available
No Data Available
Transmitter FIFO Full
Condition Specification Table for ‘‘cc’’
000B 0 Loop back
Loop back
Meaning
immediate (optional syntax)
immediate
Z
e
jump on not zero
jump on not zero
a
0) If the condition is
Condition Tested for
Z
Z
Z
Z
C
C
V
V
N
N
RA
RA
RE
RE
DAV
DAV
TFF
TFF
(Continued)
127 to
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
b
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
128 relative
141
Figure 6-1 if condition is not met
Figure 6-2 if condition is met
Instruction Format
T-states
2 if condition is not met
3 if condition is met
Bus Timing
Operation
JMP f s n
If flag f is in state s
Jcc n
If cc condition is true
1
15
then PC
then PC
Opcode
1
value for the position of DAV in TSR
Note The value of f for DAV differs from the numeric
0
0
1
2
3
4
5
6
7
f
a
a
1
n(sign extended)
n(sign extended)
Flag Reference Table for ‘‘f’’
11
s
(binary)
(000)
(001)
(010)
(011)
(100)
(101)
(110)
(111)
10
f
7
Flag Reference
Z
C
V
N
RA
RE
DAV in TSR
TFF in TSR
PC
PC
in CCR
in CCR
in CCR
in CCR
in TSR
in TSR
n
0