User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 155 of 909 2019 Ambiq Micro, Inc.
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Figure 5. Block Diagram for Flash and OTP Memory Subsystem
3.9.1 Features
The Apollo3 Blue MCU integrates four kinds of memory as shown in Figure 5:
▪ SRAM
▪ Integrated Flash / External Flash via MSPI (with Flash cache)
▪ Boot Loader ROM
▪ One Time Programmable (OTP) memory
Key features include:
▪ 384KB SRAM
32KB SRAM
ARM M4
Core
AHB Fabric
Instruction
Data
SYS
32KB SRAM 32KB SRAM 32KB SRAM
32KB SRAM 32KB SRAM
24KB SRAM
8KB SRAM
Boot
Loader
ROM
Bridge
512KB Flash
Instance
512KB Flash
Instance
APB
Flash &
OTP
Control
16KB OTP
32KB SRAM 32KB SRAM 32KB SRAM
32KB SRAM 32KB SRAM
Flash Cache
Up To 64MB External
Flash Instance