HT37B90/HT37B70/HT37B50/HT37B30
Mnemonic
Rotate
Description
Cycles Flag Affected
RRA [m]
RR [m]
Rotate Data Memory right with result in ACC
Rotate Data Memory right
1
1Note
1
None
None
C
RRCA [m]
RRC [m]
RLA [m]
RL [m]
Rotate Data Memory right through Carry with result in ACC
Rotate Data Memory right through Carry
Rotate Data Memory left with result in ACC
Rotate Data Memory left
1Note
C
1
None
None
C
1Note
1
RLCA [m]
RLC [m]
Rotate Data Memory left through Carry with result in ACC
Rotate Data Memory left through Carry
1Note
C
Data Move
MOV A,[m]
MOV [m],A
MOV A,x
Move Data Memory to ACC
Move ACC to Data Memory
Move immediate data to ACC
1
1Note
1
None
None
None
Bit Operation
CLR [m].i
SET [m].i
Clear bit of Data Memory
Set bit of Data Memory
1Note
1Note
None
None
Branch
JMP addr
SZ [m]
Jump unconditionally
2
None
None
None
None
None
None
None
None
None
None
None
None
None
Skip if Data Memory is zero
1Note
1note
1Note
1Note
1Note
1Note
1Note
1Note
2
SZA [m]
SZ [m].i
SNZ [m].i
SIZ [m]
Skip if Data Memory is zero with data movement to ACC
Skip if bit i of Data Memory is zero
Skip if bit i of Data Memory is not zero
Skip if increment Data Memory is zero
Skip if decrement Data Memory is zero
Skip if increment Data Memory is zero with result in ACC
Skip if decrement Data Memory is zero with result in ACC
Subroutine call
SDZ [m]
SIZA [m]
SDZA [m]
CALL addr
RET
Return from subroutine
2
RET A,x
RETI
Return from subroutine and load immediate data to ACC
Return from interrupt
2
2
Table Read
TABRDC [m]
TABRDL [m]
Read table (current page) to TBLH and Data Memory
Read table (last page) to TBLH and Data Memory
2Note
2Note
None
None
Miscellaneous
NOP
No operation
1
1Note
1Note
1
None
None
CLR [m]
Clear Data Memory
SET [m]
Set Data Memory
None
CLR WDT
CLR WDT1
CLR WDT2
SWAP [m]
SWAPA [m]
HALT
Clear Watchdog Timer
TO, PDF
TO, PDF
TO, PDF
None
Pre-clear Watchdog Timer
Pre-clear Watchdog Timer
Swap nibbles of Data Memory
Swap nibbles of Data Memory with result in ACC
Enter power down mode
1
1
1Note
1
None
1
TO, PDF
Note: 1. For skip instructions, if the result of the comparison involves a skip then two cycles are required,
if no skip takes place only one cycle is required.
2. Any instruction which changes the contents of the PCL will also require 2 cycles for execution.
3. For the ²CLR WDT1² and ²CLR WDT2² instructions the TO and PDF flags may be affected by
the execution status. The TO and PDF flags are cleared after both ²CLR WDT1² and
²CLR WDT2² instructions are consecutively executed. Otherwise the TO and PDF flags
remain unchanged.
Rev. 1.00
67
June 22, 2017
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
