UPI-41A/41AH/42/42AH USER’S MANUAL
JNTO address
Jump if TEST 0 is Low
Opcode:
0 0 1 0
0 1 1 0
#
a
7
a
6
a
5
a
4
a
3
a
2
a
1
a
0
This is a 2-cycle instruction. Control passes to the specified address, if the TEST 0 signal is
low. Pin is sampled during SYNC.
(PC
0–7
)
w
addr
if T
0
e
0
Example:
JT0LOW: JNT0 60
;JUMP TO LOCATION 60 DEC
;IF T
0
e
0
JNT1 address
Jump If TEST 1 is Low
Opcode:
0 1 0 0
0 1 1 0
#
a
7
a
6
a
5
a
4
a
3
a
2
a
1
a
0
This is a 2-cycle instruction. Control passes to the specified address if the TEST 1 signal is low.
Pin is sampled during SYNC.
(PC
0–7
)
w
addr
if T
1
e
0
Example:
JT1LOW: JNT1 OBBH
;JUMP TO LOCATION ‘BB’ HEX
;IF T
1
e
0
JNZ address
Jump If Accumulator Is Not Zero
Opcode:
1 0 0 1
0 1 1 0
#
a
7
a
6
a
5
a
4
a
3
a
2
a
1
a
0
This is a 2-cycle instruction. Control passes to the specified address if the accumulator con-
tents are nonzero at the time this instruction is executed.
(PC
0–7
)
w
addr
if A
i
0
Example:
JACCNO: JNZ OABH
;JUMP TO LOCATION ‘AB’ HEX
;IF ACC VALUE IS NONZERO
JOBF Address
Jump If Output Buffer Full Flag Is Set
Opcode:
1 0 0 0
0 1 1 0
#
a
7
a
6
a
5
a
4
a
3
a
2
a
1
a
0
This is a 2-cycle instruction. Control passes to the specified address if the Output Buffer Full
(OBF) flag is set (
e
1) at the time this instruction is executed.
(PC
0–7
)
w
addr
if OBF
e
1
Example:
JOBFHI: JOBF OAAH
;JUMP TO LOCATION ‘AA’ HEX
;IF OBF
e
1
JTF address
Jump If Timer Flag is Set
Opcode:
0 0 0 1
0 1 1 0
#
a
7
a
6
a
5
a
4
a
3
a
2
a
1
a
0
This is a 2-cycle instruction. Control passes to the specified address if the timer flag is set to
one, that is, the timer/counter register overflows to zero. The timer flag is cleared upon
execution of this instruction. (This overflow initiates an interrupt service sequence if the timer-
overflow interrupt is enabled.)
(PC
0–7
)
w
addr
if TF
e
1
Example:
JTF1: JTF TIMER
;JUMP TO ‘TIMER’ ROUTINE
;IF TF
e
1
40
Содержание UPI- 41A
Страница 1: ...October 1993 Microprocessor Peripherals UPI 41A 41AH 42 42AH User s Manual Order Number 231318 006 ...
Страница 4: ......
Страница 12: ...UPI 41A 41AH 42 42AH USER S MANUAL 231318 7 Figure 2 2 Pin Configuration 231318 8 Figure 2 3 Logic Symbol 8 ...
Страница 65: ...UPI 41A 41AH 42 42AH USER S MANUAL 231318 42 Figure 5 11 Distributed Processor System 61 ...
