56853 datasheet(17/60 Pages) FREESCALE

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Introduction

56853 Technical Data, Rev. 6

Freescale Semiconductor

106

HACK

HRRQ

GPIOB15

Input

Open Drain

Output

Input/Output

Host Acknowledge (HACK)—When the HI08 is programmed for

HRMS=0 functionality (typically used on a single-data-strobe bus),

this input has two functions: (1) provide a Host Acknowledge signal

for DMA transfers or (2) to control handshaking and provide a Host

Interrupt Acknowledge compatible with the MC68000 family

processors.

These pins are disconnected internally.

Receive Host Request (HRRQ)—This signal is the Receive Host

Request output when the HI08 is programmed for HRMS=1

functionality and is typically used on a double-data-strobe bus.

Port B GPIO(15)—This pin is a General Purpose I/O (GPIO) pin

when not configured for host port usage.

101

TIO0

GPIOG0

Input/Output

Timer Input/Outputs (TIO0)—This pin can be independently

configured to be either a timer input source or an output flag.

Port G GPIOG0—This pin is a General Purpose I/O (GPIO) pin that

can individually be programmed as an input or output pin.

TIO1

GPIOG1

Input/Output

Timer Input/Outputs (TIO1)—This pin can be independently

configured to be either a timer input source or an output flag.

Port G GPIO (1)—This pin is a General Purpose I/O (GPIO) pin that

can individually be programmed as an input or output pin.

TIO2

GPIOG2

Input/Output

Timer Input/Outputs (TIO2)—This pin can be independently

configured to be either a timer input source or an output flag.

Port G GPIO (2)—This pin is a General Purpose I/O (GPIO) pin that

can individually be programmed as an input or output pin.

TIO3

GPIOG3

Input/Output

Timer Input/Outputs (TIO3)—This pin can be independently

configured to be either a timer input source or an output flag.

Port G GPIO (3)—This pin is a General Purpose I/O (GPIO) pin that

can individually be programmed as an input or output pin.

IRQA

Input

External Interrupt Request A and B—The IRQA and IRQB inputs

are asynchronous external interrupt requests that indicate that an

external device is requesting service. A Schmitt trigger input is used

for noise immunity. They can be programmed to be level-sensitive or

negative-edge- triggered. If level-sensitive triggering is selected, an

external pull-up resistor is required for Wired-OR operation.

IRQB

MODA

GPIOH0

Input

Input/Output

Mode Select (MODA)—During the bootstrap process MODA selects

one of the eight bootstrap modes.

Port H GPIO (0)—This pin is a General Purpose I/O (GPIO) pin after

the bootstrap process has completed.

Table 3-1. 56853 Signal and Package Information for the 128-pin LQFP (Continued)

Pin No.

Signal Name

Type

Description

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