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MC68340 データシート(PDF) 36 Page - Freescale Semiconductor, Inc

部品番号 MC68340
部品情報  Integrated Processor with DMA User?셲 Manual
Download  441 Pages
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メーカー  FREESCALE [Freescale Semiconductor, Inc]
ホームページ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68340 データシート(HTML) 36 Page - Freescale Semiconductor, Inc

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MC68340 USER’S MANUAL
MOTOROLA
2.1 SIGNAL INDEX
The input and output signals for the MC68340 are listed in Table 2-1. The name,
mnemonic, and brief functional description are presented. For more detail on each signal,
refer to the signal paragraph. Guaranteed timing specifications for the signals listed in
Table 2-1 can be found in Section 11 Electrical Characteristics.
Table 2-1. Signal Index
Signal Name
Mnemonic
Function
Input/
Output
Address Bus
A23–A0
Lower 24 bits of the address bus
Out
Address Bus/Port A7–A0/
Interrupt Acknowledge
A31–A24
Upper eight bits of the address bus, parallel I/O port, or
interrupt acknowledge lines
Out/I/O/Out
Data Bus
D15–D0
The 16-bit data bus used to transfer byte or word data
I/O
Function Codes
FC3–FC0
Identify the processor state and the address space of the
current bus cycle
Out
Chip Select 3–1/
Interrupt Request Level/
Port B4, B2, B1
CS3–CS1
Enables peripherals at programmed addresses, interrupt
priority level to the CPU32, or parallel I/O port
Out/In/
I/O
Chip Select 0/Autovector
CS0
Enables peripherals at programmed addresses or
requests an automatic vector
Out/In
Bus Request
BR
Indicates that an external device requires bus mastership
In
Bus Grant
BG
Indicates that current bus cycle is complete and the
MC68340 has relinquished the bus
Out
Bus Grant Acknowledge
BGACK
Indicates that an external device has assumed bus
mastership
In
Data and Size
Acknowledge
DSACK1,
DSACK0
Provides asynchronous data transfers and dynamic bus
sizing
In
Read-Modify-Write Cycle
RMC
Identifies the bus cycle as part of an indivisible read -
modify-write operation
Out
Address Strobe
AS
Indicates that a valid address is on the address bus
Out
Data Strobe
DS
During a read cycle,
DS indicates that an external device
should place valid data on the data bus. During a write
cycle,
DS indicates that valid data is on the data bus.
Out
Size
SIZ1, SIZ0
Indicates the number of bytes remaining to be transferred
for this cycle
Out
Read/Write
R/
W
Indicates the direction of data transfer on the bus
Out
Interrupt Request Level/
Port B7, B6, B5, B3
IRQ7, IRQ6,
IRQ5, IRQ3
Provides an interrupt priority level to the CPU32 or
becomes a parallel I/O port
In/I/O
Reset
RESET
System reset
I/O
Halt
HALT
Suspends external bus activity
I/O
Bus Error
BERR
Indicates an invalid bus operation is being attempted
In
System Clock
CLKOUT
System clock out
Out
Crystal Oscillator
EXTAL, XTAL
Connections for an external crystal or oscillator to the
internal oscillator circuit
In, Out
External Filter Capacitor
XFC
Connection pin for an external capacitor to filter the circuit
of the phase-locked loop
In
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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