Universal Peripheral Interface User's Manual

UPI-C42/UPI-L42
Table 4. UPI Instruction Set (Continued)
Mnemonic Description Bytes Cycles
CONTROL (Continued)
*SUSPEND Invoke Suspend Power- 1 2
down mode
NOP No Operation 1 1
REGISTERS
INC Rr Increment register 1 1
INC
@
Rr Increment data 1 1
memory
DEC Rr Decrement register 1 1
SUBROUTINE
CALL addr Jump to subroutine 2 2
RET Return 1 2
RETR Return and restore 1 2
status
FLAGS
CLR C Clear Carry 1 1
CPL C Complement Carry 1 1
CLR F0 Clear Flag 0 1 1
CPL F0 Complement Flag 0 1 1
CLR F1 Clear F1 Flag 1 1
CPL F1 Complement F1 Flag 1 1
Mnemonic Description Bytes Cycles
BRANCH
JMP addr Jump unconditional 2 2
JMPP
@
A Jump indirect 1 2
DJNZ Rr, addr Decrement register 2 2
and jump
JC addr Jump on Carry
e
12 2
JNC addr Jump on Carry
e
02 2
JZ addr Jump on A Zero 2 2
JNZ addr Jump on A not Zero 2 2
JT0 addr Jump on T0
e
122
JNT0 addr Jump on T0
e
022
JT1 addr Jump on T1
e
122
JNT1 addr Jump on T1
e
022
JF0 addr Jump on F0 Flag
e
12 2
JF1 addr Jump on F1 Flag
e
12 2
JTF addr Jump on Timer Flag 2 2
e
1, Clear Flag
JNIBF addr Jump on IBF Flag 2 2
e
0
JOBF addr Jump on OBF Flag 2 2
e
1
JBb addr Jump on Accumula- 2 2
for Bit
*UPI-C42/UPI-L42 Only.
REVISION SUMMARY
The following has been changed since Revision
-003:
1. Delete all references to standby power down
mode.
The following has been changed since Revision
-002:
1. Added information on keyboard controller prod-
uct family.
2. Added I
HI
specification for the UPI-L42.
The following has been changed since Revision
-001:
1. Added UPI-L42 references and specification.
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