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Signal Name
Address Bus
Address Bus Port A7–A0/
Interrupt Acknowledge
Data Bus
Function Codes
Chip Select 3/Interrupt Request
Level/Port B4, B2, B1
Chip Select 0/Autovector
Bus Request
Bus Grant
Bus Grant Acknowledge
Data and Size Acknowledge
Read-Modify-Write Cycle
Address Strobe
Data Strobe
Size
Read/Write
Interrupt Request Level/
Port B7, B6, B5, B3
Reset
Halt
Bus Error
System Clock
Crystal Oscillator
External Filter Capacitor
Clock Mode Select/Port B0
Instruction Fetch/
Development Serial In
Instruction Pipe/
Development Serial Out
Breakpoint/
Development Serial Clock
Freeze
Receive Data
2-14
Freescale Semiconductor, Inc.
Table 2-5. Signal Summary
Mnemonic
A23–A0
A31–A24
D15–D0
FC3–FC0
CS3–CS1
CS0
BR
BG
BGACK
DSACK1,
DSACK0
RMC
AS
DS
SIZ1, SIZ0
R/ W
IRQ7, IRQ6,
IRQ5, IRQ3
RESET
HALT
BERR
CLKOUT
EXTAL, XTAL
XFC
MODCK
IFETCH /DSI
IPIPE /DSO
BKPT /DSCLK
FREEZE
RxDA, RxDB
MC68340 USER'S MANUAL
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Input/Output
Active State
Out
—
Out/I/O/Out
—/—/Low
I/O
—
Out
—
Out/In/I/O
Low/Low/—
Out/In
Low/Low
In
Low
Out
Low
In
Low
In
Low
Out
Low
Out
Low
Out
Low
Out
—
Out
High/Low
In/I/O
Low/—
I/O
Low
I/O
Low
In
Low
Out
—
In, Out
—
In
—
In/I/O
—/—
Out/In
Low/—
Out/Out
Low/—
In/In
Low/—
Out
High
In
—
Three-State
Yes
Yes
Yes
Yes
No
No
—
No
—
—
Yes
Yes
Yes
Yes
Yes
—
No
No
—
No
—
—
—
No/—
No/—
—/—
No
—
MOTOROLA
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