SAF-C164SM Infineon Technologies, SAF-C164SM Datasheet - Page 172

• Manufacturer Part Number: SAF-C164SM
• Description: 16-Bit CMOS Microcontroller
• Manufacturer: Infineon Technologies

C164CM/C164SM
Derivatives
External Bus Interface
Preferred External Bus Mode
Due to the low pin count of the C164CM, many alternate input/output signals use the pins
of PORT0 and PORT1, thus competing with the External Bus Interface. Many
applications will require the alternate signals to make use of the on-chip peripherals, so
the applicable bus modes are restricted.
Most of the CAPCOM signals use PORT1, so demultiplexed bus modes will only be used
for specific applications.
The standard serial interfaces use the upper pins of PORT0, so 16-bit bus modes can
only be used if the application can do without this serial communication.
8-bit multiplexed bus mode solves this contradiction by restricting the address width to
11 bits. This provides communication via the standard serial interfaces and control of
external peripherals (or small memories) at the same time.
Even though the C164CM’s EBC supports all four bus modes providing access to up to
64 KBytes of external resources, 8-bit multiplexed bus mode represents a good choice
for many applications providing access to 2 KBytes of external resources (most probably
peripheral registers).
Note: Please also refer to the description of PORT0 in
Section
7.3.
User’s Manual
9-3
V1.0, 2002-02