ATSAMB11XR datasheet(29/87 Pages) MICROCHIP

29 / 87 page

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BROWNOUT DETECTED

7.1.3.11 GPIO Controller

The AHB GPIO is a general-purpose I/O interface unit that allows the CPU to independently control all

input or output signals on the ATSAMB11-XR2100A and ATSAMB11-ZR210CA. These can be used for a

wide variety of functions pertaining to the application.

The AHB GPIO provides a 16-bit I/O interface with the following features:

•

Programmable interrupt generation capability

•

Programmable masking support

•

Thread-safe operation by providing separate set and clear addresses for control registers

•

Inputs are sampled using a double flip-flop to avoid meta-stability issues

7.2

Memory Subsystem

The Cortex-M0 core uses a 128 KB instruction/boot ROM along with a 128 KB shared instruction and

data RAM.

Refer to BluSDK SMART BLE API Software Development Guide for the memory map of this memory

section.

7.2.1

Shared Instruction and Data Memory

The Instruction and Data Memory (IDRAM1 and IDRAM2) contains instructions and data used by the

ARM. The 128 KB size of IDRAM1 and IDRAM2 is used for BLE subsystem and also for the user

application. IDRAM1 contains three 32 KB memories and IDRAM2 contains two 16 KB memories that are

accessible to the ARM and used for instruction/data storage.

7.2.2

ROM

The ROM is used to store the boot code and BLE firmware, stack, and selected user profiles. The ROM

contains the 128 KB memory that is accessible to the ARM. The Boot loader code stored in ROM loads

the application from Flash to RAM.

7.2.3

BLE Retention Memory

The BLE functionality requires 8 KB state, instruction, and data to be retained in memory, when the

processor either goes into Sleep mode or Power down mode. The RAM is separated into specific power

domains to allow tradeoff in power consumption with retention memory size.

7.3

Non-Volatile Memory

The ATSAMB11-XR2100A and ATSAMB11-ZR210CA have 768 bits of non-volatile eFuse memory that

can be read by the CPU after device reset. This memory region is one-time- programmable. It is

ATSAMB11XR/ZR

Datasheet Preliminary

DS70005342A-page 29

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