Motorola M68CPU32BUG User Manual download pdf (Page 62)

SUPPORT INFORMATION

M68332BCC/D 5-6 MOTOROLA

REV 1

Table 5-2. P2 Expansion Connector Pin Assignments (continued)

Pin Number

Signal Mnemonic

Signal Name And Description

49, 50

DSACK0

DSACK1

DATA AND SIZE ACKNOWLEDGE – Active-low input

signals that allow asynchronous data transfers and

dynamic bus sizing between the MC68332 and external

devices.

AVEC

AUTOVECTOR – Active-low input signal that requests

an automatic vector during an interrupt acknowledge

cycle.

RMC

READ-MODIFY-WRITE CYCLE – Active-low output

signal that identifies the bus cycle as part of an

indivisible read-modify-write operation.

DATA STROBE – Active-low output signal, that during

a read cycle, indicates that an external device should

place valid data on the data bus. During the write cycle,

DS indicates that valid data is on the data bus.

ADDRESS STROBE – Active-low output signal that

indicates that a valid address is on the address bus.

55, 56 SIZ0, SIZ1 TRANSFER SIZE – Active-low output signals that

indicate the number of bytes remaining to be

transferred during this cycle.

11RESET

Not connected.

58 CLKOUT SYSTEM CLOCK OUT – Output signal that is the

MC68332 internal system clock.

59 EXTAL EXTERNAL CLOCK INPUT – External clock input for

the MC68332 MCU device.

HALT

HALT – Active-low input/output signal that suspends

external bus activity, to request a retry when used with

BERR

, or for single-step operation.

61, 62 +5V +5 VOLT INPUT POWER

63, 64 GND GROUND

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 68

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Motorola M68CPU32BUG User Manual Page 62

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