DSP56303 查看數據表（PDF） - Freescale Semiconductor

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DSP56303

DSP56303 24-bit digital signal processor (DSP)

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 VCC 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

PIN

False

Deasserted

VCC3

PIN

True

Asserted

VCC

PIN

False

Deasserted

Ground

Notes: 1.

2.

3.

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).

DSP56303 User’s Manual, Rev. 2

1-2

Freescale Semiconductor

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