Manual Conventions; High True/Low True Signal Conventions - Motorola DSP56303 User Manual

Manual Conventions

Chapter 6, Host Interface (HI08)—Signals, architecture, programming model, reset,
interrupts, external host programming model, initialization, and a quick reference to
the HI08 programming model.
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
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 . See Table 1-1.
CC
Signal/Symbol
1
PIN
PIN
1-2
Table 1-1. High True/Low True Signal Conventions
Logic State
True
False
DSP56303 User's Manual
Signal State
Asserted
Deasserted
or
CC
Voltage
2
Ground
3
V
CC