DSP56857 datasheet(82/662 Pages) FREESCALE

82 / 662 page

Power, Ground and Peripheral Signals

5685X Digital Signal Controller User Manual, Rev. 4

2-14

Freescale Semiconductor

Table 2-7. Quad Timer Module

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

TIO0

(GPIOG0)

Input / Output

Timer Input/Output—This pin can be

independently configured to be either a timer input

source or an output.

Port G GPIO 0—This is a General Purpose I/O pin

when not configured for Timer use.

TIO1-TIO3

(GPIOG0-G3)

Input / Output

Timer Input/Output—These pins can be

independently configured to be either a timer input

source or an output.

Port G GPIO 1-3—These are General Purpose I/O

pins when not configured for Timer use.

—

Table 2-8. Interrupt and Program Control

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

IRQA

Input

External Interrupt Request A and B—These

inputs are asynchronous external interrupt

requests, indicating 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 or Wired-OR operation.

IRQB

Input

MODA,

MODB,

MODC

(GPIOH0-H2)

Input

Input / Output

Mode Select—During the bootstrap process,

MODA, MODB, and MODC selects one of the

eight bootstrap modes.

Mode Select—During the bootstrap process, the

MODE A, B, and C pins select one of the eight

bootstrap modes. These pins are sampled at the

end of reset.

Port H GPIO 0-2—These are General Purpose I/O

pins after the bootstrap process has completed.

Note: Any time POR and EXTERNAL resets are

active the state of MODE A, B and C pins get

asynchronous transferred to the SIM Control

bits determine the mode in which the part will boot

up.

Note: Software and COP resets do not update the

SIM Control Register.

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