Datasheet

41.5.9 Analog Connections
Not applicable.
41.6 Functional Description
41.6.1 Principle of Operation
Configurable Custom Logic (CCL) is a programmable logic block that can use the device port pins,
internal peripherals, and the internal Event System as both input and output channels. The CCL can
serve as glue logic between the device and external devices. The CCL can eliminate the need for
external logic component and can also help the designer overcome challenging real-time constrains by
combining core independent peripherals in clever ways to handle the most time critical parts of the
application independent of the CPU.
41.6.2 Operation
41.6.2.1 Initialization
The following bits are enable-protected, meaning that they can only be written when the corresponding
even LUT is disabled (LUTCTRLx.ENABLE=0):
• Sequential Selection bits in the Sequential Control x (SEQCTRLx.SEQSEL) register
The following registers are enable-protected, meaning that they can only be written when the
corresponding LUT is disabled (LUTCTRLx.ENABLE=0):
• LUT Control x (LUTCTRLx) register, except the ENABLE bit
Enable-protected bits in the LUTCTRLx registers can be written at the same time as LUTCTRLx.ENABLE
is written to '1', but not at the same time as LUTCTRLx.ENABLE is written to '0'.
Enable-protection is denoted by the Enable-Protected property in the register description.
41.6.2.2 Enabling, Disabling, and Resetting
The CCL is enabled by writing a '1' to the Enable bit in the Control register (CTRL.ENABLE). The CCL is
disabled by writing a '0' to CTRL.ENABLE.
Each LUT is enabled by writing a '1' to the Enable bit in the LUT Control x register (LUTCTRLx.ENABLE).
Each LUT is disabled by writing a '0' to LUTCTRLx.ENABLE.
The CCL is reset by writing a '1' to the Software Reset bit in the Control register (CTRL.SWRST). All
registers in the CCL will be reset to their initial state, and the CCL will be disabled. Refer to 41.8.1 CTRL
for details.
41.6.2.3 Lookup Table Logic
The lookup table in each LUT unit can generate any logic expression OUT as a function of three inputs
(IN[2:0]), as shown in Figure 41-2. One or more inputs can be masked. The truth table for the expression
is defined by TRUTH bits in LUT Control x register (LUTCTRLx.TRUTH).
SAM D5x/E5x Family Data Sheet
CCL – Configurable Custom Logic
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1396