z16f2811 ZiLOG Semiconductor, z16f2811 Datasheet - Page 55

• Manufacturer Part Number: z16f2811
• Description: High Performance Microcontrollers
• Manufacturer: ZiLOG Semiconductor

PS022006-0207
Table 8. Example Usage of Chip Selects
Chip
Select
CS0
CS1
CS2
CS3
Tools Compatibility Guidelines
Memory/Peripheral
64 KB Internal Flash
8 MB External ROM
or Flash
128 KB External RAM
External Ethernet MAC
External CAN controller.
The external interface offers the designer the flexibility to place external devices in almost
any range of the 24-bit address space. The primary hardware consideration is that more
chip selects are available in high memory and devices needing more than 15 Wait states
must use one of chip selects CS[2–5]. Once a design is completed, it is necessary to
develop software for it. The task of designing application software is much easier if the
hardware designer considers the following guidelines:
•
The microcontroller’s internal Flash must be enabled during software development.
This simplifies downloading of program code and allows the ZDS II default program
configuration to be used. If the internal Flash is disabled, the address space beginning
at
option bits, vectors, and application startup code.
00_0000H
must address external Flash or other memory containing the necessary
000000H
010000H
080000H
0AFFFFH
F00000H
FFC800H
F80000H
Address
Lower
P R E L I M I N A R Y
00FFFFH
7FFFFFH
09FFFFH
0EFFFFH
F3FFFFH
FFCFFFH
FFFFFFH
Address
Upper
Program Code, Look-up Tables, and
Interrupt Vectors.
Program Code and Look-up Tables.
Lowest 64 KB of the 8 MB is
inaccessible as the on-chip Flash has
higher priority for addresses 000000H
through 00FFFFH.
Stack and Data is placed anywhere in
CS1 address space except where
higher priority CS2 or CS3 overlaps.
Unused addresses as no external
memory placed in these locations.
Ethernet MAC is an example of an
external communication peripheral that
is connected to the external interface.
CAN controller is another example of
an external communication peripheral
that is connected to the external
interface.
Unused addresses as no external
memory or peripherals placed in these
locations.
Typical Uses
Product Specification
ZNEO
External Interface
™
Z16F Series
41