Holtek HT46R22, Handbook

Page: 96 / 162

Mnemonic Description Cycles Flag Affected
Branch
JMP addr
SZ [m]
SZA [m]
SZ [m].i
SNZ [m].i
SIZ [m]
SDZ [m]
SIZA [m]
SDZA [m]
CALL addr
RET
RET A,x
RETI Jump unconditionally
Skip if Data Memory is zero
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
Return from subroutine
Return from subroutine and load immediate data to ACC
Return from interrupt 2
1
Note
1
note
1
Note
1
Note
1
Note
1
Note
1
Note
1
Note
2
2
2
2
None
None
None
None
None
None
None
None
None
None
None
None
None
Table Read
TABRDC [m]
TABRDL [m] Read table (current page) to TBLH and Data Memory
Read table (last page) to TBLH and Data Memory 2
Note
2
Note
None
None
Miscellaneous
NOP
CLR [m]
SET [m]
CLR WDT
CLR WDT1
CLR WDT2
SWAP [m]
SWAPA [m]
HALT No operation
Clear Data Memory
Set Data Memory
Clear Watchdog Timer
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
Note
1
Note
1
1
1
1
Note
1
1
None
None
None
TO, PDF
TO, PDF
TO, PDF
None
None
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
²
CLR WDT1
²
and
²
CLR WDT2
²
instructions the TO and PDF flags may be affected by
the execution status. The TO and PDF flags are cleared after both
²
CLR WDT1
²
and
²
CLR WDT2
²
instructions are consecutively executed. Otherwise the TO and PDF flags
remain unchanged.
Chapter 2 Instruction Set Introduction
87