Table of Contents
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INDEX
AH register, 2-5
AL register, 2-5, 2-18, 2-23
ApBUILDER files, obtaining from BBS, 1-6
Application BBS, 1-5
Architecture
CPU block diagram, 2-2
device feature comparisons, 1-2
family introduction, 1-1
overview, 1-1, 2-1
Arithmetic
instructions, 2-19–2-20
interpretation of 8-bit numbers, 2-20
Arithmetic Logic Unit (ALU), 2-1
Array bounds trap (Type 5 exception), 2-43
ASCII, defined, 2-37
Automatic EOI mode‚ See Interrupts
Auxiliary Flag (AF), 2-7, 2-9
AX register, 2-1, 2-5, 2-18, 2-23, 3-6
B
Base Pointer (BP)‚ See BP register
Baud Rate Compare Register (BxCMP), 11-12
Baud Rate Counter Register (BxCNT), 11-11
BBS, 1-5
BCD, defined, 2-37
Bit manipulation instructions, 2-21–2-22
BOUND instruction, 2-43, A-8
BP register, 2-1, 2-13, 2-30, 2-34
Breakpoint interrupt (Type 3 exception), 2-43
Bulletin board system (BBS), 1-5
Bus cycles, 3-20–3-47
address/status phase, 3-10–3-12
and 80C187, 14-11
and CSU, 6-14
and Idle mode, 5-13
and PCB accesses, 4-4
and Powerdown mode, 5-16
and T-states, 3-9
data phase, 3-13
HALT cycle, 3-29–3-36
and chip-selects, 6-4
HALT state, exiting, 3-32–3-36
idle states, 3-18
instruction prefetch, 3-20
interrupt acknowledge (INTA) cycles, 3-6,
3-26–3-27, 8-3
and cascaded 8259As, 8-16–8-17
Index-2
and chip-selects, 6-4
and external 8259A devices, 8-45
and ICU, 8-44
operation, 3-7–3-20
priorities, 3-46–3-47, 7-2
read cycles, 3-20–3-22
refresh cycles, 3-22–3-23, 7-4, 7-5
control signals, 7-5, 7-6
during HOLD, 3-43–3-45, 7-13–7-14
wait states, 3-13–3-18
write cycles, 3-23–3-26
See also Data transfers
Bus hold protocol, 3-41–3-46
and CLKOUT, 5-6
and CSU, 6-15
and Idle mode, 5-14
and refresh cycles, 3-43–3-45, 7-13–7-14
and reset, 5-9
latency, 3-42–3-43
Bus Interface Unit (BIU), 2-1, 2-3, 2-11, 3-1–3-47
and DMA, 10-8
and DRAM refresh requests, 7-4
and TCU, 9-1
buffering the data bus, 3-37–3-39
modifying interface, 3-36–3-39, 3-39
relationship to RCU, 7-1
synchronizing software and hardware events,
3-39–3-40
using a locked bus, 3-40–3-41
using multiple bus masters, 3-41–3-46
BX register, 2-1, 2-5, 2-30
C
Carry Flag (CF), 2-7, 2-9
Cascade bus, 8-14
Chip-Select Unit (CSU), 6-1
and DMA, 10-9
and DMA acknowledge signal, 10-30
and HALT bus cycles, 3-29
and READY, 6-11–6-12
and wait states, 6-11–6-12
block diagram, 6-3
bus cycle decoding, 6-14
examples, 6-15–6-20
features and benefits, 6-1
functional overview, 6-2–6-5
programming, 6-5–6-15
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