Motorola MC68340 manual CTSA, Ctsb

Freescale Semiconductor, Inc...

Freescale Semiconductor, Inc.

Table 2-1. Signal Index (Continued)

			Input/
Signal Name	Mnemonic	Function	Output
Clock Mode Select/	MODCK	Selects the source of the internal system clock upon reset	In/I/O
Port B0		or becomes a parallel I/O port
Instruction Fetch/	IFETCH/DSI	Indicates when the CPU32 is performing an instruction	Out/In
Development Serial In		word prefetch and when the instruction pipeline has been
		flushed or provides background debug mode serial in
Instruction Pipe/	IPIPE/DSO	Used to track movement of words through the instruction	Out/Out
Development Serial Out		pipeline or provides background debug mode serial out
Breakpoint/Development	BKPT/DSCLK	Signals a hardware breakpoint to the CPU32 or provides	In/—
Serial Clock		background debug mode serial clock
Freeze	FREEZE	Indicates that the CPU32 has entered background debug	Out
		mode
Transmit Data	TxDA, TxDB	Transmitter serial data output from the serial module	Out
Clear-to-Send	CTSA, CTSB	Serial module clear-to-send inputs	In
Request-to-Send/	RTSB, RTSA	Channel request-to-send outputs or discrete outputs	Out/Out
OP1, OP0
Serial Crystal Oscillator	X1, X2	Connections for an external crystal to the serial module
		internal oscillator circuit
Serial Clock	SCLK	External serial module clock input	In
Transmitter Ready/OP6	T≈RDYA	Indicates transmit buffer has a character or becomes a	Out/Out
		parallel output
Receiver Ready/	R≈RDYA	Indicates receive buffer has a character, the receiver	Out/Out/Out
FIFO Full/OP4		FIFO buffer is full or becomes a parallel output
DMA Request	DRE	Input that starts a DMA process	In
	Q2, DREQ1
DMA Acknowledge	DACK2,	Output that signals an access during DMA	Out
	DACK1
DMA Done	DONE2,	Bi-directional signal that indicates the last transfer	I/O
	DONE1
Timer Gate	TGATE2,	Counter enable input to timer	In
	TGATE1
Timer Input	TIN2, TIN1	Time reference input to timer	In
Timer Output	TOUT2,	Output waveform from timer	Out
	TOUT1
Test Clock	TCK	Provides a clock for IEEE 1149.1 test logic	In
Test Mode Select	TMS	Controls test mode operations	In
Test Data In	TDI	Shifts in instructions and test data	In
Test Data Out	TDO	Shifts out instructions and test data	Out
Synchronizer Power	VCCSYN	Quiet power supply to VCO; also used to control	—
		synthesizer mode after reset.
System Power Supply	VCC , GND	Power supply and ground to the MC68340	—
and Ground

MOTOROLAMC68340 USER’S MANUAL2- 3

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