DSP56374UMSLASHD datasheet(9/64 Pages) FREESCALE

Part #	DSP56374UM/D

Description	a high-density CMOS device

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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Signal Groupings

DSP56374 Data Sheet, Rev. 4.2

Freescale Semiconductor

9

4.6

Serial Host Interface

The SHI has five I/O signals that can be configured to allow the SHI to operate in either SPI or I2C mode.

PH2

Input, output,

or

disconnected

Port H2—When the MODC/IRQC is configured as GPIO, this signal is

individually programmable as input, output, or internally disconnected.

MODD/IRQD

Input

MODD

Input

Mode Select D/External Interrupt Request D—MODD/IRQD is an

active-low Schmitt-trigger input, internally synchronized to the DSP

clock. MODD/IRQD selects the initial chip operating mode during

hardware reset and becomes a level-sensitive or

negative-edge-triggered, maskable interrupt request input during

normal instruction processing. This pin can also be programmed as

GPIO. MODA, MODB, MODC, and MODD select one of 16 initial chip

operating modes, latched into OMR when the RESET signal is

de-asserted.

This pin has an internal pull up resistor.

This input is 5 V tolerant.

PH3

Input, output,

or

disconnected

Port H3—When the MODD/IRQD is configured as GPIO, this signal is

individually programmable as input, output, or internally disconnected.

RESET

Input

Reset—RESET is an active-low, Schmitt-trigger input. When asserted,

the chip is placed in the Reset state and the internal phase generator is

reset. The Schmitt-trigger input allows a slowly rising input (such as a

capacitor charging) to reset the chip reliably. When the RESET signal is

de-asserted, the initial chip operating mode is latched from the MODA,

MODB, MODC, and MODD inputs. The RESET signal must be asserted

during power up. A stable EXTAL signal must be supplied while RESET

is being asserted.

This pin has an internal pull up resistor.

This input is 5 V tolerant.

Table 8. Interrupt and Mode Control (continued)

Signal Name

Type

State

during

Reset

Signal Description

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DSP56374UM/D Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc

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