TC1920 Datasheet, PDF (21/78 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1920
Preliminary
System Control Unit (SCU)
The System Control Unit of the TC1920 basically handles all system control tasks. All
these system functions are tightly coupled and therefore they are handled physically by
one unit, the SCU. The system tasks of the SCU are:
• Clock Generation and Control
• Reset control
• Power Management control and wake-up
• Watchdog timer
• Trace port control
• Device identification
• Standby SRAM control
• External interrupt capability (8 sources)
System timer (STM)
The System Timer is designed for global system timing applications requiring both high
precision and long range. It is used by the CPU for software operating system issues.
Features:
• Free-running 56-bit counter
• All 56 bits can be read synchronously
• Different 32-bit portions of the 56-bit counter can be read synchronously
• Driven by clock, f _STM (normally identical with the system clock).
• Counting begins at power-on reset
• Continuous operation is not affected by any reset condition except power-on reset
Data Sheet
17
V 1.3, 2003-10