MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 284
MC68000
Manufacturer Part Number
MC68000
Description
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68000.pdf
(480 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68000-10/BZAJC
Manufacturer:
MOT
Quantity:
26
Company:
Part Number:
MC68000-8BXAJ
Manufacturer:
MOT
Quantity:
9
Company:
Part Number:
MC680008FN8
Manufacturer:
FREESCALE
Quantity:
8 831
Company:
Part Number:
MC68000FN10
Manufacturer:
MOT
Quantity:
5 510
Part Number:
MC68000FN10
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
Company:
Part Number:
MC68000FN12
Manufacturer:
MOT
Quantity:
5 510
Part Number:
MC68000L8
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
Part Number:
MC68000P10
Manufacturer:
MOT
Quantity:
20 000
- Current page: 284 of 480
- Download datasheet (2Mb)
Signal Description
DREQ/PA13—DMA Request
This input is asserted by a peripheral device to request an operand transfer between that
peripheral device and memory. In the cycle steal request generation mode, this input is
edge-sensitive. In burst mode, it is level-sensitive.
DACK/PA14—DMA Acknowledge
This output, asserted by the IDMA, signals to the peripheral that an operand is being trans-
ferred in response to a previous transfer request.
DONE/PA15—DONE
This bidirectional, open-drain signal is asserted by the IDMA or by a peripheral device during
any IDMA bus cycle to indicate that the data being transferred is the last item in a block. The
IDMA asserts this signal as an output during a bus cycle when the byte count register is dec-
remented to zero. Otherwise, this pin is an input to the IDMA to terminate IDMA operation.
5.17 IACK OR PIO PORT B PINS
The IACK or PIO port B pins are shown in Figure 5-14.
Each one of these three pins can be used either as an interrupt acknowledge signal or as a
general-purpose parallel I/O port. Note that the IMP interrupt controller does not require the
use of the IACK pins when it supplies the interrupt vector for the external source. The input
buffers have Schmitt triggers.
IACK7/PB0
IACK6/PB1
IACK1/PB2—Interrupt Acknowledge/Port B I/O
As IACK1, IACK6, and IACK7, these active low output signals indicate to the external device
that the MC68302 is executing an interrupt acknowledge cycle. The external device must
then place its vector number on the lower byte of the data bus or use AVEC for autovectoring
(unless internal vector generation is used).
5.18 TIMER PINS
The timer pins are shown in Figure 5-15.
5-20
Figure 5-14. IACK or PIO Port B Pins
MC68302 USER’S MANUAL
MC68302
IACK7 / PB0
IACK6 / PB1
IACK1 / PB2
MOTOROLA
Related parts for MC68000
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Motorola, Inc [VOLTAGE REGULATOR]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
6367254 MOTOROLA SC (XSTRS/R F)
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
MC1494LMotorola, Inc [MONOLITHIC FOUR-QUADRANT MULTIPLIER]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
MC1466LMotorola, Inc [PRECISION WIDE RANGE VOLTAGE AND CURRENT REGULATOR]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
MC145532DWMotorola, Inc [ADPCM Transcoder]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
Silicon Controlled Rectifiers
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF Power Field Effect Transistors N-Channel Enhancement-Mode Lateral MOSFETs
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF POWER FIELD EFFECT TRANSISTORS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
LATERAL N-CHANNEL BROADBAND RF POWER MOSFETs
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF POWER FIELD EFFECT TRANSISTOR
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF LOW POWER TRANSISTOR NPN SILICON
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
PLASTIC SURFACE MOUNT ZENER DIODES 1.5 WATTS 3.3-68 VOLTS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
OVERVOLTAGE TRANSIENT SUPPRESSOR
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
TMOS POWER FET 15 AMPERES 60 VOLTS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
TMOS POWER FET LOGIC LEVEL 19 AMPERES 30 VOLTS RDS(on) = 0.099 OHM
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet: