TC1796
Peripheral Units (Vol. 2 of 2)
General Purpose Timer Array (GPTA)
User’s Manual 24-55 V2.0, 2007-07
GPTA, V2.0
24.2.3.2 Global Timer Cell (GTC)
The GPTA provides 32 Global Timer Cells (GTC00 to GTC31) used for capture/compare
operations.
Registers
The following registers are assigned to a GTCk (k = 00-31):
• GTCCTRk = Global Timer Cell Control Register k (see Page 24-175)
• GTCXRk = Global Timer Cell X Register k (see Page 24-179)
• SRSC1 = Service Request State Clear Register 1 (see Page 24-209)
• SRSS1 = Service Request State Set Register 1 (see Page 24-210)
Features
• 24-bit based timer cells related to two Global Timers GT0 and GT1.
• Capture Mode on rising, falling or both edges with following actions:
– Service request generation
– Output signal transition generation (set, reset, toggle the output signal)
• Compare Mode on equal compare, or greater than, or equal to compare with
following actions:
– Service request generation
– Output signal transition generation (set, reset, toggle the output signal)
– Capture (after compare match) the value of the selected Global Timer or the
opposite Global Timer
• One Shot Mode allows the selected (capture or compare) mode to be stopped after
the first event.
• Flexible mechanism to link pin actions and allow complex combination of cells. (A
cell has the ability to propagate actions over adjacent cells with higher number, in
order to perform complex waveforms such as PWMs).
Architecture
The architecture of a GTC is shown in Figure 24-43. Each GTC has a multiplexer that
allows selection of the GT0 or GT1 Global Timer value bus as data source, a 24-bit
capture/compare register GTCXk, and a 24-bit equal comparator.
The 32 Global Timer Cells (GTC00 to GTC31) have the following inputs:
• Two Global Timer value buses, GTV0 and GTV1, coming from the two Global Timers
and carrying the GT0 and GT1 timer values
• Two inputs, TEV0 and TEV1, reporting GT0 and GT1 timer value updates
• Two inputs, TGE0 and TGE1, reporting the result of the GT0 and GT1 compare
operations
• A trigger input (GTCkIN) that is connected via the GTC input multiplexer to one of the
following signal sources:
To Next Page
Loading...
Need help?
General