Data Sheet

NUC123
May 3, 2017 Page 52 of 99 Rev.2.04
NUC123 SERIES DATASHEET
Flash Memory Controller (FMC) 6.4
6.4.1 Overview
The NuMicro
®
NUC123 series is equipped with 68/36 Kbytes on-chip embedded flash for
application program memory (APROM) and Data Flash, and 4 Kbytes for ISP loader program
memory (LDROM) that could be programmed boot loader to update APROM and Data Flash
through In-System-Programming (ISP) procedure. The ISP function enables user to update
embedded flash when chip is soldered on PCB. After chip is powered on, Cortex
®
-M0 CPU
fetches code from APROM or LDROM decided by boot select (CBS (Config0[7:6]). User can also
select to enable or disable In-Application-Programming (IAP) function through boot select (CBS
(Config0[7:6]). Also, the NUC123 provides Data Flash for user, to store some application
dependent data before chip is powered off.
6.4.2 Features
 Runs up to 72 MHz and optional up to 50MHz with zero wait state for continuous address
read access
 Supports 68/36 KB application program ROM (APROM)
 Supports 4KB loader ROM (LDROM)
 Supports Data Flash with configurable memory size
 Supports 8 bytes User Configuration block to control system initiation
 Supports 512 bytes page erase for all embedded flash
 Supports In-System-Programming (ISP) / In-Application-Programming (IAP) to update
embedded flash memory