PXD20 datasheet(12/130 Pages) FREESCALE

12 / 130 page

Overview

PXD20 Microcontroller Data Sheet, Rev. 2

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

•

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

•

modification until next reset.

1.4.8

On-chip flash memory with ECC

The PXD20 microcontroller has the following flash memory features:

•

2 MB of flash memory

— Typical flash memory access time: 0 wait-state for buffer hits, 3 wait-states for page buffer miss at 125 MHz

— Two 4 × 128-bit page buffers with programmable prefetch control

–

One set of page buffers can be allocated for code-only, fixed partitions of code and data, all available for any

access

–

One set of page buffers allocated to Display Controller Units, Graphics Accelerator and the eDMA

— 64-bit ECC with single-bit correction, double-bit detection for data integrity

•

Small block flash arrangement to support features such as boot block, EEPROM Emulation, operating system block.

—8

16 KB

—2

64 KB

—2

128 KB

—6

256 KB

•

Hardware managed Flash writes, erase and verify sequence

•

Censorship protection scheme to prevent Flash content visibility

1.4.9

Static random-access memory (SRAM)

The PXD20 microcontroller has 64 KB general-purpose on-chip SRAM with the following features:

•

Typical SRAM access time: 1 wait-state for reads and 32-bit writes

•

32-bit ECC with single-bit correction, double bit detection for data integrity

•

Supports byte (8-bit), half word (16-bit), word (32-bit) and double-word (64-bit) writes for optimal use of memory

•

User transparent ECC encoding and decoding for byte, half word, and word accesses

•

Separate internal power domains applied to 56 KB and 8 KB SRAM blocks during STANDBY modes to retain

contents during low power mode.

1.4.10

On-chip graphics SRAM

The PXD20 microcontroller has 1 MB on-chip graphics SRAM with the following features:

•

Two crossbar slave ports:

— One dedicated to the 2D Graphics Accelerator (GFX2D) access

— One dedicated to all other crossbar masters

•

Usable as general purpose SRAM

•

Supports byte (8-bit), half word (16-bit), word (32-bit) and double-word (64-bit) writes for optimal use of memory

•

RAM controller with hardware RAM fill function supporting all-zeroes or all-ones SRAM initialization

•

Independent data buffers (one per AHB port) for maximum system performance

— Optimized for burst transfers (read + write)

— Programmable read prefetch capabilities

PXD20 Datasheet(PDF) 12 Page - Freescale Semiconductor, Inc

PXD20 Datasheet(HTML) 12 Page - Freescale Semiconductor, Inc

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