PXD20RM Datasheet, PDF (60/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

• 32 external interrupts
1.5.6 QuadSPI serial flash memory controller
The QuadSPI module enables use of external serial flash memories supporting single, dual and quad
modes of operation. It features the following:
• Maximum serial clock frequency 80 MHz
• Memory mapped read access for AHB crossbar switch masters
• Automatic serial flash read command generation by CPU, eDMA, DCU, or DCU-Lite read access
on AHB bus
• Supports single, dual and quad serial flash read commands
• Simultaneous mode:
— Supports concurrent read of two external serial flashes
— The quad data streams from the two flashes can be recombined in the QuadSPI to achieve up
to 80 MB/s read bandwidth with 80 MHz serial flash
• 1664-bit buffer with speculative fetch and buffer flush mechanisms to maximize read bandwidth
of serial flash
• DMA support
• All Serial Flash program, erase, read and configuration commands available via IP bus interface.
1.5.7 System Integration Unit Lite (SIUL)
The SIUL controls MCU reset configuration, pad configuration, external interrupt, general purpose I/O
(GPIO), internal peripheral multiplexing, and the system reset operation.
The GPIO features the following:
• Up to four levels of internal pin multiplexing, allowing exceptional flexibility in the allocation of
device functions for each package
• Centralized general purpose input output (GPIO) control
• All GPIO pins can be independently configured to support pull-up, pull down, or no pull
• Reading and writing to GPIO supported both as individual pins and 16-bit wide ports
• All peripheral pins can be alternatively configured as both general purpose input or output pins
except ADC channels which support alternative configuration as general purpose inputs
• Direct readback of the pin value supported on all digital output pins through the SIU
• Configurable digital input filter that can be applied to up to 24 general purpose input pins for noise
elimination on external interrupts
• Register configuration protected against change with soft lock for temporary guard or hard lock to
prevent modification until next reset.
1.5.8 On-chip flash memory with ECC
The PXD20 microcontroller has the following flash memory features:
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PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor