DSP56303 datasheet(12/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

1-2

Freescale Semiconductor

DSP56303 Overview

Chapter 7, Enhanced Synchronous Serial Interface (ESSI). Enhancements, data and

control signals, programming model, operating modes, initialization, exceptions, and

GPIO.

Chapter 8, Serial Communication Interface (SCI). Signals, programming model,

operating modes, reset, initialization, and GPIO.

Chapter 9, Triple Timer Module. Architecture, programming model, and operating modes

of three identical timer devices available for use as internals or event counters.

Appendix A, Bootstrap Code. Bootstrap code and equates for the DSP56303.

Appendix B, Programming Reference. Peripheral addresses, interrupt addresses, and

interrupt priorities for the DSP56303; programming sheets listing the contents of the

major DSP56303 registers for programmer’s reference.

1.2 Manual Conventions

This manual uses the following conventions:

Bits within registers are always listed from most significant bit (MSB) to least significant

bit (LSB).

Bits within a register are indicated AA[n – m], n > m, when more than one bit is involved

in a description. For purposes of description, the bits are presented as if they are

contiguous within a register. However, this is not always the case. Refer to the

programming model diagrams or to the programming sheets to see the exact location of

bits within a register.

When a bit is “set,” its value is 1. When a bit is “cleared,” its value is 0.

The word “assert” means that a high true (active high) signal is pulled high to V

CC or that

a low true (active low) signal is pulled low to ground. The word “deassert” means that a

high true signal is pulled low to ground or that a low true signal is pulled high to VCC. See

Table 1-1.

Table 1-1. High True/Low True Signal Conventions

Signal/Symbol

Logic State

Signal State

Voltage

PIN1

True

Asserted

Ground2

False

Deasserted

VCC

True

Asserted

VCC

False

Deasserted

Ground

Notes: 1.

PIN is a generic term for any pin on the chip.

Ground is an acceptable low voltage level. See the appropriate data sheet for the range of acceptable low

voltage levels (typically a TTL logic low).

VCC is an acceptable high voltage level. See the appropriate data sheet for the range of acceptable high

voltage levels (typically a TTL logic high).

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