PXN20RM Datasheet, PDF (50/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Introduction
— Each port supported with separate page buffers
• Flash page buffers to improve access time to code and data held in flash
— 4  128-bit page buffers with programmable prefetch control for flash access
— Page buffers can be allocated for code-only, fixed partitions of code and data, all available for
any access
• Censorship protection scheme to prevent flash content visibility
• EE emulation supported by small 16 KB flash blocks in main array with multiple read while write
partitions
• Hardware managed flash writes, erase and verify sequence
• Supports flash writes using internal 16 MHz RC oscillator
• Flash partitioning:
Table 2. Flash Partitioning
Flash_Base + 0x0000_0000
Flash_Base + 0x0000_4000
Flash_Base + 0x0000_8000
Flash_Base + 0x0000_C000
Flash_Base + 0x0001_0000
Flash_Base + 0x0001_4000
Flash_Base + 0x0001_8000
Flash_Base + 0x0001_C000
Flash_Base + 0x0002_0000
Flash_Base + 0x0003_0000
Flash_Base + 0x0004_0000
Flash_Base + 0x0006_0000
Flash_Base + 0x0008_0000
Flash_Base + 0x000C_0000
Flash_Base + 0x0010_0000
Flash_Base + 0x0014_0000
Flash_Base + 0x0018_0000
Flash_Base + 0x001C_0000
Shadow Block
PXN20
2 MB
16 KB
16 KB
16 KB
16 KB
16 KB
16 KB
16 KB
16 KB
64 KB
64 KB
128 KB
128 KB
256 KB
256 KB
256 KB
256 KB
256 KB
256 KB
16 KB
• Error correction status
— Configurable error-correcting codes (ECC) reporting for RAM and flash
PXN20 Microcontroller Reference Manual, Rev. 1
1-8
Freescale Semiconductor