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This group enables you to define memory-mapped registers provided at the board or ASIC level. Each register is named and typed and can be subdivided into bit fields (any number of bits) which act as subregisters.
The Register group includes a base group
called Default, but typically you create one or
more named register groups. The group includes the following settings:
This group contains settings to define bit fields within the registers.
The base address
of the register. If the register is mapped using a memory block,
this is the offset from that register (see Base).
The length of the
register. If Length is set by a register, this
must be 0 or the amount to add to that register.
This specifies how
to interpret Start. You can select the value
from a context menu. This context menu contains the option Absolute,
and is also populated with the names of any memory blocks that you
have configure in the Memory_block group:
If you select Absolute, then Start is
the absolute memory address of the register.
If you select the name of a memory block, then Start is
an offset from the base address of that memory block.
The
type of memory depends on the device type. The default is to map
to data space. Otherwise, a memory space can be specified. Set to default for
ARM architecture-based targets.
Specifies how to interpret the value contained in the register. The type names are as in the C language.
If set to True,
the register is read-only and the debugger does not let you write
to it. Otherwise, you can modify the value using the Registers view in
the Code window and using CLI expressions.
If set to True,
the register cannot be read. The debugger does not attempt to query
the hardware for the current value when the Registers view is displayed.
If set to True,
the register value can change without the debugger explicitly modifying
it. For example, a hardware timer continues to count even when the
processor is halted.
The name of a Register_enum block
that maps a register value to a textual string describing the value.
The name of the register as it appears in the Registers view. If no name is specified here, then the Register group name is displayed.
The Register Bit_fields group
contains a Default group, but typically you create
one or more named Bit_fields groups. The group
contains the following settings:
Bit position from 0 (LSbit).
Size in bits.
Set to True if
signed, otherwise set to False.
Enumeration name
to show values in the Registers view, derived from the Register_enum group.
Set
to True if read-only (cannot modify).
Indicates that the register has side effects when it is read or written. A common read side effect is loss of data (when pulled from a UART, for example). A common write side effect is for the device to take some action on write (triggering a DMA, for example). This information is used in the Registers view. Right-click to see available options.
Optional name for showing in Registers view. If no name is specified here, then the bit field group name is displayed.
| Copyright © 2002-2009 ARM Limited. All rights reserved. | ARM DUI 0182K |
| Non-Confidential | |
| PDF version | |
| Home > Connection Properties Reference > Memory mapping Advanced_Information settings reference > Register |