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#0data16, A-3
#1data16, A-3
#data
definition, A-3
#data16, A-3
#short, A-3
8XC251SA, SB, SP, SQ, 1-1
block diagram, 2-2
on-chip peripherals, 2-3
8XC251Sx, 1-1
8XC51FX, 2-1
A
A15:8, 7-1
description, 13-2
A16
description, 13-2
AC flag, 5-18, 5-19, C-20
ACALL instruction, 5-15, A-24, A-26
ACC, 3-13, 3-17, 3-18, C-2, C-3, C-7
Accumulator, 3-15
in register file, 3-13
See also ACC
AD7:0, 7-1
description, 13-2
ADD instruction, 5-8, A-14
ADDC instruction, 5-8, A-14
addr11, 5-13, A-3
addr16, 5-13, A-3
addr24, 5-13, A-3
Address spaces, See Memory space, SFRs, Register
file, External memory, Compatibility
Addresses
internal vs external, 4-9
Addressing modes, 3-8, 5-4
See also Data instructions, Bit instructions,
Control instructions
AJMP instruction, 5-15, A-24
ALE
caution, 11-7
description, 13-2
extending, 4-13
following reset, 11-7
idle mode, 12-4
programming and verifying nonvolatile
memory, 14-3
ANL instruction, 5-9, 5-11
for bits, A-23
ANL/ instruction, 5-11
for bits, A-23
Arithmetic instructions, 5-8, 5-9
table of, A-14, A-15, A-16
B
B register, 3-15, C-7
as SFR, 3-17, 3-18, C-2, C-3
in register file, 3-13
Base address, 5-4
Baud rate, See Serial I/O port, Timer 1, Timer 2
Big endien form, 5-2
Binary and source modes, 2-4, 4-13–4-15, 5-1
opcode maps, 4-14
selection guidelines, 2-4, 4-14
Bit address
addressing modes, 5-12
definition, A-3
examples, 5-11
Bit instructions, 5-1, 5-11–5-12
addressing modes, 5-4, 5-11
bit51, 5-11, A-3
Broadcast address, See Serial I/O port
Bulletin board service (BBS), 1-7, 1-8
Bus cycles, 13-3
nonpage mode, 13-4
page mode, 13-5
C
Call instructions, 5-15
Capacitors
bypass, 11-2
CCAP1H–CCAP4H, CCAP1L–CCAP4L, 3-17, 3-
20, C-2, C-5, C-8
CCAPM1–4, 3-17, 3-19, 9-15, C-2, C-5, C-9
interrupts, 6-5
CCON, 3-17, 3-19, 9-14, C-2, C-5, C-10
Ceramic resonator, 11-4
CEX4:0, 7-1
CH, CL, 3-17, 3-20, C-2, C-5, C-10
INDEX
Index-1
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