Information

Flash
Controller
EzPort
Flash Memory
Microcontroller
Core
EzPort Enabled
G
Reset Controller
Reset
Reset Out
EZP_CS
EZP_CK
EZP_D
EZP_Q
Figure 29-1. EzPort block diagram
29.1.2 Features
EzPort includes the following features:
• Serial interface that is compatible with a subset of the SPI format.
• Ability to read, erase, and program flash memory.
• Ability to reset the microcontroller, allowing it to boot from the flash memory after
the memory has been configured.
29.1.3 Modes of operation
The EzPort can operate in one of two modes, enabled or disabled.
• Enabled — When enabled, the EzPort steals access to the flash memory, preventing
access from other cores or peripherals. The rest of the microcontroller is disabled to
avoid conflicts. The flash is configured for NVM Special mode.
• Disabled — When the EzPort is disabled, the rest of the microcontroller can access
flash memory as normal.
Overview
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
560 Freescale Semiconductor, Inc.