user manual

INSTRUCTION DESCRIPTIONS
MOTOROLA INSTRUCTION SET DETAILS A - 111
Restrictions: A JCLR instruction cannot be repeated using the REP instruction.
A JCLR located at LA, LA–1, or LA–2 of the DO loop cannot specify the program control-
ler registers SR, SP, SSH, SSL, LA, or LC as its target.
JCLR SSH or JCLR SSL cannot follow an instruction that changes the SP.
Example:
:
JCLR #$5,X:<<$FFF1,$1234 ;go to P:$1234 if bit 5 in SCI SSR is clear
:
Explanation of Example: In this example, program execution is transferred to the
address P:$1234 if bit 5 (PE) of the 8-bit read-only X memory location X:$FFF1 (I/O SCI
interface status register) is a zero. If the specified bit is not clear, no jump is taken, and
the program counter (PC) is incremented by one.
Condition Codes:
For destination operand A or B:
S —Computed according to the definition. See Notes on page A-115.
L — Set if data limiting has occurred. See Notes on page A-115.
E — Not affected
U — Not affected
N — Not affected
Z — Not affected
V — Not affected
C — Not affected
For other source operands:
The condition codes are not affected.
JCLR Jump if Bit Clear JCLR
MR CCR
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
LF DM T
**
S1 S0 I1 I0 S L E U N Z V C