Kinetis K21: 50MHz Cortex-M4 up to 512KB Flash (121pin)
Kinetis K21 Data Sheet: 50MHz high-performance ArmВ® CortexВ®-M4 microcontroller(MCU), USB, advanced security/anti-tamper, up to 512KB Flash/64KB SRAM (121pin)
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Kinetis K21: 50MHz Cortex-M4 up to 512KB Flash (121pin)
Kinetis K21 Data Sheet: 50MHz high-performance ArmВ® CortexВ®-M4 microcontroller(MCU), USB, advanced security/anti-tamper, up to 512KB Flash/64KB SRAM (121pin)