Datasheet
Table Of Contents
- Part 1 Overview
- Part 2 Signal/Connection Descriptions
- 2.1 Introduction
- 2.2 Power and Ground Signals
- 2.3 Clock and Phase Locked Loop Signals
- 2.4 Address, Data, and Bus Control Signals
- 2.5 Interrupt and Program Control Signals
- 2.6 GPIO Signals
- 2.7 Pulse Width Modulator (PWM) Signals
- 2.8 Serial Peripheral Interface (SPI) Signals
- 2.9 Quadrature Decoder Signals
- 2.10 Serial Communications Interface (SCI) Signals
- 2.11 CAN Signals
- 2.12 Analog-to-Digital Converter (ADC) Signals
- 2.13 Quad Timer Module Signals
- 2.14 JTAG/OnCE
- Part 3 Specifications
- 3.1 General Characteristics
- 3.2 DC Electrical Characteristics
- 3.3 AC Electrical Characteristics
- 3.4 Flash Memory Characteristics
- 3.5 External Clock Operation
- 3.6 External Bus Asynchronous Timing
- 3.7 Reset, Stop, Wait, Mode Select, and Interrupt Timing
- 3.8 Serial Peripheral Interface (SPI) Timing
- 3.9 Quad Timer Timing
- 3.10 Quadrature Decoder Timing
- 3.11 Serial Communication Interface (SCI) Timing
- 3.12 Analog-to-Digital Converter (ADC) Characteristics
- 3.13 Controller Area Network (CAN) Timing
- 3.14 JTAG Timing
- Part 4 Packaging
- Part 5 Design Considerations
- Part 6 Ordering Information
External Bus Asynchronous Timing
56F805 Technical Data, Rev. 16
Freescale Semiconductor 33
Figure 3-11 External Bus Asynchronous Timing
1. Timing is both wait state- and frequency-dependent. In the formulas listed, WS = the number of wait states and
T = Clock Period. For 80MHz operation, T = 12.5ns.
2. Parameters listed are guaranteed by design.
To calculate the required access time for an external memory for any frequency < 80Mhz, use this formula:
Top = Clock period @ desired operating frequency
WS = Number of wait states
Memory Access Time = (Top*WS) + (Top- 11.5)
A0–A15,
PS
, DS
(See Note)
WR
D0–D15
RD
Note: During read-modify-write instructions and internal instructions, the address lines do not change state.
Data In
Data Out
t
AWR
t
ARDA
t
ARDD
t
RDA
t
RD
t
RDRD
t
RDWR
t
WRWR
t
WR
t
DOS
t
WRD
t
WRRD
t
AD
t
DOH
t
DRD
t
RDD