MC68340 datasheet(277/441 Pages) FREESCALE

277 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

6- 27

CCR1, CCR2

$788, $7A8

9876543210

INTB

INTN

INTE

ECO

SAPI

DAPI

SSIZE

DSIZE

REQ

S/D

STR

RESET:

UUUUUUUUUUUUUUU0

U = Unaffected by reset

Supervisor/User

INTB—Interrupt Breakpoint

Setting the interrupt breakpoint bit sets the BRKP bit in the CSR. The logic AND of INTB

and BRKP generates an interrupt request.

1 = Enables an

IRQ

≈ when a breakpoint is recognized and the channel is the bus

master.

0 = Does not enable an

IRQ

≈ when a breakpoint is recognized and the channel is

the bus master.

INTN—Interrupt Normal

1 = Enables an

IRQ

≈ when the channel finishes a transfer without an error condition

(CSR DONE bit is set).

0 = Does not enable an

IRQ

≈ when the channel finishes a transfer without an error

condition.

INTE—Interrupt Error

1 = Enables an

IRQ

≈ when the channel encounters an error on source read (CSR

BES bit is set), destination write (CSR BED bit is set), or configuration for

channel setup (CSR CONF bit is set).

0 = Does not enable an

IRQ

≈ when the channel encounters an error on source read,

destination write, or configuration for channel setup.

ECO—External Control Option

If request generation is programmed to be internal (REQ bits = 00), this bit has no

effect.

Single-Address Mode—This bit defines the direction of transfer.

1 = If request generation is programmed to be external (REQ = 1x), the requesting

device receives the data (read from memory), and the control signals (

DREQ

≈,

DACK

≈, and DONE≈) are used by the requesting device to write data during the

source (read) portion of the transfer.

0 = If request generation is programmed to be external (REQ = 1x), the requesting

device provides the data (write to memory), and the control signals (

DREQ

≈,

DACK

≈, and DONE≈) are used by the requesting device to provide data during

the destination (write) portion of the transfer.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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