Intel 80C196NU, User Manual

Page: 314 / 471

A-9
INSTRUCTION SET REFERENCE
ANDB
(3 operands) LOGICAL AND BYTES. ANDs the two source
byte operands and stores the result into the
destination operand. The result has ones in
only the bit positions in which both operands
had a “1” and zeros in all other bit positions.
(DEST)
←
(SRC1) AND (SRC2)
DEST, SRC1, SRC2
ANDB Dbreg, Sbreg, baop
(010100aa) (baop) (Sbreg) (Dbreg)
PSW Flag Settings
Z N C V VT ST
✓ ✓
0 0 — —
BMOV BLOCK MOVE. Moves a block of word data
from one location in memory to another. The
source and destination addresses are
calculated using the indirect with autoin-
crement addressing mode. A long register
(PTRS) addresses the source and destination
pointers, which are stored in adjacent word
registers. The source pointer (SRCPTR) is
the low word and the destination pointer
(DSTPTR) is the high word of PTRS. A word
register (CNTREG) specifies the number of
transfers. The blocks of data can be located
anywhere in page 00H of register RAM, but
should not overlap. Because the source
(SRCPTR) and destination (DSTPTR)
pointers are 16 bits wide, this instruction uses
nonextended data moves. It cannot operate
across page boundaries. For example,
SRCPTR cannot point to a location on page
05 while DSTPTR points to page 00.
SRCPTR and DSTPTR will operate from the
page defined by EP_REG. EP_REG should
be set to 00H to select page 00H (see
“Accessing Data” on page 5-23). (The
80C196NU forces EP_REG to 00H.)
COUNT
←
(CNTREG)
LOOP: SRCPTR
←
(PTRS)
DSTPTR
←
(PTRS + 2)
(DSTPTR)
←
(SRCPTR)
(PTRS)
←
2
(PTRS + 2)
←
2
COUNT
←
COUNT – 1
if COUNT
≠
0 then
go to LOOP
PTRS, CNTREG
BMOV lreg, wreg
(11000001) (wreg) (lreg)
NOTE: The pointers are autoincre-
mented during this instruction.
However, CNTREG is not decre-
mented. Therefore, it is easy to
unintentionally create a long,
uninterruptible operation with the
BMOV instruction. Use the
BMOVI instruction for an interrupt-
ible operation.
PSW Flag Settings
Z N C V VT ST
— — — — — —
Table A-6. Instruction Set (Continued)
Mnemonic Operation Instruction Format