SAK-C164CM-4EF Infineon Technologies AG, SAK-C164CM-4EF Datasheet - Page 17

• Manufacturer Part Number: SAK-C164CM-4EF
• Description: 16-Bit Single-Chip Microcontrol ler
• Manufacturer: Infineon Technologies AG

External Bus Controller
All of the external memory accesses are performed by a particular on-chip External Bus
Controller (EBC). It can be programmed either to Single Chip Mode when no external
memory is required, or to one of two different external memory access modes, which are
as follows:
– 16-bit Addresses, 16-bit Data, Multiplexed
– 11-bit Addresses, 8-bit Data, Multiplexed
Both addresses and data use PORT0 for input/output.
Important timing characteristics of the external bus interface (Memory Cycle Time,
Memory Tri-State Time, Length of ALE and Read Write Delay) have been made
programmable to allow the user the adaption of a wide range of different types of
memories and external peripherals.
In addition, up to 4 independent address windows may be defined (via register pairs
ADDRSELx / BUSCONx) which control the access to different resources with different
bus characteristics. These address windows are arranged hierarchically where
BUSCON4 overrides BUSCON3 and BUSCON2 overrides BUSCON1. All accesses to
locations not covered by these 4 address windows are controlled by BUSCON0.
Note: The programmable bus features and the window mechanism are standard
The C164CM will preferably be used in single-chip mode. Applications which require
access to external resources such as peripherals or small memories, will use the 8-bit
data bus with 11-bit address bus in most cases. In this case the upper pins of PORT0
can be used for the serial interfaces. If a wider address or a 16-bit data bus is required
the serial interfaces cannot be used.
Data Sheet
features of the C166 architecture. Due to the C164CM’s limited external address
space, however, they can be utilized only to a small extend.
13
V1.0, 2001-05
C164CM
C164SM