Motorola MC68340 manual Signal Summary, Signal Name Mnemonic Input/Output Active State

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

Table 2-5. Signal Summary

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

2- 14MC68340 USER’S MANUALMOTOROLA

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