Infineon Technologies TC1796 - Page 1666

TC1796
Peripheral Units (Vol. 2 of 2)
General Purpose Timer Array (GPTA)
User’s Manual 24-11 V2.0, 2007-07
GPTA, V2.0
FPC Operating Modes
Each filter and prescaler cell can be individually configured to operate in one of the
following operating modes:
• Delayed Debounce Filter Mode on both edges
• Immediate Debounce Filter Mode on both edges
• Rising edge: Immediate Debounce Filter Mode, falling edge: No filtering
• Rising edge: No filtering, falling edge: Immediate Debounce Filter Mode
• Rising edge: Delayed Debounce Filter Mode, falling edge: Immediate Debounce
Filter Mode
• Rising edge: Immediate Debounce Filter Mode, falling edge: Delayed Debounce
Filter Mode
• Prescaler Mode (triggered on rising edge)
• Prescaler Mode (triggered on falling edge)
The operation mode is selected by bit field FPCCTRk.MOD (Page 24-156).
FPC Input Signals
Bit field FPCCTRk.IPS (see Page 24-156) selects one of the following inputs for FPCk:
• Signal input 0 (SINk0)
• Signal input 1(SINk1)
• Signal input 2 (SINk2)
• Signal input 3 (SINk3)
• GPTA module clock f
GPTA
(SINk4)
• Preceding FPC level output signal SOLk-1 (SIN05 is connected to SOL5)
When the preceding FPC level output signal is selected as input, two or more FPCs may
be concatenated; for example, to combine a delayed debounce filter and an immediate
debounce filter.
The maximum FPC input signal frequency must be less than or equal to the sampling
rate (f
GPTA
/2). The assignment of GPTA I/O line and FPC signal inputs SINk is defined
in “FPC Input Line Selection” on Page 24-94.
FPC Filter Clocks
Bit field FPCCTRk.CLK (see Page 24-157) selects one of four filter clocks for FPCk:
• Clock input line 0 (CINk0) = GPTA module clock f
GPTA
• Clock input line 1 (CINk1) = local PLL clock,
• Clock input line 2 (CINk2) = (prescaled) GPTA module clock f
GPTA
or PLL clock from
other unit or DCM 3 clock
• Clock input line 3 (CINk3) = DCM 2 clock or PLL clock of other unit or
uncompensated PLL clock or uncompensated PLL clock of other unit
When using a PLL clock for the FPC, no software is needed to adapt the FPC filter to
changing speed for angle-based input signals. The standard PLL clock can be either the