Freescale Semiconductor DSP56366 Bedienungsanleitung PDF herunterladen (Seite 23)

DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4

Freescale Semiconductor iii

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

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 V

• Pins or signals that are asserted low (made active when pulled to ground)

— In text, have an overbar (e.g., RESET is asserted low).

— In code examples, have a tilde in front of their names. In example below, line 3 refers to the

SS0 pin (shown as ~SS0).

• Sets of pins or signals are indicated by the first and last pins or signals in the set (e.g., HA1–HA8).

• Code examples are displayed in a monospaced font, as shown below:

Example Sample Code Listing

BFSET #$0007,X:PCC Configure: line 1

; MISO0, MOSI0, SCK0 for SPI master line 2

; ~SS0 as PC3 for GPIO line 3

• Hex values are indicated with a dollar sign ($) preceding the hex value, as follows: $FFFFFF is the

X memory address for the core interrupt priority register (IPR-C).

• The word “reset” is used in four different contexts in this manual:

— the reset signal, written as “RESET,”

— the reset instruction, written as “RESET,”

— the reset operating state, written as “Reset,” and

— the reset function, written as “reset.”

High True/Low True Signal Conventions

Signal/Symbol Logic State Signal State Voltage

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

True Asserted Ground

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).

PIN False Deasserted V

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

high voltage levels (typically a TTL logic high).

PIN True Asserted V

PIN False Deasserted Ground

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Freescale Semiconductor DSP56366 Bedienungsanleitung Seite 23