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BUS
Controller
Flash
MCU(HMS39C7092)
42
3.1
Overview
The
HMS39C7092
has
an
on-chip
bus
controller
that
manages
the
external
address
space
divided
into
eight
areas,
which
can
attaches
SRAM,
ROM,
Flash-memory
or
off-chip
peripheral
devices.
The
bus
specifications,
such
as
bus
width
and
number
of
access
states,
can
be
set
independently
for
each
area,
enabling
multiple
memories
to
be
connected
easily.
3.1.1
Features
The
features
of
the
bus
controller
are
listed
below.
•
8-bit
access
or
16-bit
access
can
be
selected
for
each
area
(In
THUMB
mode,
only
16-bit
accessing
of
external
code
memory
is
allowed)
•
Active
low
chip
select
signals
(
nCS
0
to
nCS
7
)
can
be
output
for
area
0
to
7
•
Bus
specifications
can
be
set
independently
for
each
area
•
Support
Little-Endian
Memory
Format
•
Variable
wait
states
(up
to
16
waits)
•
Bus
transfers
can
be
extended
using
the
nWAIT
signal.
The
nWAIT
signal
is
active
LOW
•
Each
area
is
16MB(when
SM=í0í
in
PMU),
or
1MB(when
SM=í1í
in
PMU)
in
Size
and
can
be
programmed
individually.
External
BUS
Control
Signals
Wait
State
Controller
Bus
Arbiter
Address
Decoder
nCS[7:0]
nAS
nHWR
nLWR
nRD
nWAIT
nBREQ
nBACK
BUS
control
Register
Pack
BCR3
BCR2
BCR1
BCR4
BCR5
BCR6
BCR7
BCR0
Figure
3.1
Block
Diagram
of
the
Bus
Controller
Содержание HMS39C7092
Страница 1: ...HMS39C7092 32Bit Embedded Flash MCU User s Manual Version 1 2...
Страница 11: ...Flash MCU HMS39C7092 11...
Страница 12: ...Flash MCU HMS39C7092 12...
Страница 13: ...Flash MCU HMS39C7092 Introduction 13 Chapter 1 Introduction...
Страница 27: ...Flash MCU HMS39C7092 ARM7TDMI Core 27 Chapter 2 ARM7TDMI Core...
Страница 39: ...Flash MCU HMS39C7092 ARM7TDMI Core 39 2 4 4 ARM Instructions Refer to ARM7TDMI Datasheet ARM DDI 0029E...
Страница 40: ...BUS Controller Flash MCU HMS39C7092 40...
Страница 41: ...Flash MCU HMS39C7092 BUS Controller 41 Chapter 3 BUS Controller...
Страница 59: ...Flash MCU HMS39C7092 MCU controller 59 Chapter 4 MCU Controller...
Страница 67: ...Flash MCU HMS39C7092 Power Management Unit 67 Chapter 5 Power Management Unit...
Страница 77: ...Flash MCU HMS39C7092 Interrupt controller 77 Chapter 6 The Interrupt Controller...
Страница 85: ...Flash MCU HMS39C7092 Watchdog Timer 85 Chapter 7 Watchdog Timer...
Страница 98: ...Watchdog Timer Flash MCU HMS39C7092 98...
Страница 99: ...Flash MCU HMS39C7092 General Purpose Timer 99 Chapter 8 The General Purpose Timer...
Страница 118: ...General Purpose Timer Flash MCU HMS39C7092 118...
Страница 119: ...Flash MCU HMS39C7092 UART 119 Chapter 9 UART Universal Asynchronous Receiver Transmitter...
Страница 137: ...Flash MCU HMS39C7092 GPIO 137 Chapter 10 GPIO General Purpose Input Output...
Страница 142: ...GPIO Flash MCU HMS39C7092 142...
Страница 143: ...Flash MCU HMS39C7092 On Chip SRAM 143 Chapter 11 On Chip SRAM...
Страница 145: ...Flash MCU HMS39C7092 On chip Flash memory 145 Chapter 12 On chip Flash Memory...
Страница 173: ...Flash MCU HMS39C7092 A D Converter 173 Chapter 13 A D Converter...
Страница 185: ...Flash MCU HMS39C7092 Electrical Characteristics 185...
Страница 186: ...Electrical Characteristics Flash MCU HMS39C7092 186 Chapter 14 Electrical Characteristics...
Страница 195: ...Flash MCU HMS39C7092 Electrical Characteristics 195...
Страница 196: ...Electrical Characteristics Flash MCU HMS39C7092 196...
Страница 197: ...A 1 Flash MCU HMS39C7092 197 A 1 Package Dimension...