SDA6000 Datasheet, PDF (154/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Peripherals
7
Peripherals
All of the peripherals described in the following paragraphs are clocked with the same
clock as the CPU (f_{hw_clk}). Depending on the mode (normal or Idle), this frequency is
33.33 MHz or 3 MHz.
7.1
General Purpose Timer Unit
The General Purpose Timer Unit (GPT) represents very flexible multifunctional timer
structures which may be used for timing, event counting, pulse width measurement,
pulse generation, frequency multiplication, and other purposes. They incorporate five
16-bit timers that are grouped into the two timer blocks GPT1 and GPT2. Each timer in
each block may operate independently in a number of different modes such as gated
timer or counter mode, or may be concatenated with another timer of the same block.
Block 1 contains 3 timers/counters with a maximum resolution of f_{hw_clk}/4. The auxiliary
timers of GPT1 may be optionally configured as reload or capture registers for the core
timer.
Block 2 contains 2 timers/counters with a maximum resolution of f_{hw_clk}/2. An additional
CAPREL register supports capture and reload operations with extended functionality,
and its core timer T6 may be concatenated with the timers from the CAPCOM unit (T0
and T1).
The following enumeration summarizes all features to be supported:
Timer Block 1:
• f_{hw_clk}/4 maximum resolution
• 3 independent timers/counters
• Timers/counters can be concatenated
• 4 operating modes (timer, gated timer, counter, incremental)
• Separate interrupt nodes
Timer Block 2:
• f_{hw_clk}/2 maximum resolution
• 2 independent timers/counters
• Timers/counters can be concatenated
• 3 operating modes (timer, gated timer, counter)
• Extended capture/reload functions via 16-bit Capture/Reload register CAPREL
• Separate interrupt nodes
7.1.1 Functional Description of Timer Block 1
All three timers of block 1 (T2, T3, T4) can run in 4 basic modes, which are timer, gated
timer, counter and incremental interface mode. All timers can either count up or down.
Users Manual
7-3
2000-06-15