System Register Block
UG0331 User Guide Revision 15.0
671
22.0.1.2 Field Write Protect
Many System Registers contain fields of multiple bits. A Field Write Protect bit provides write protection
for an entire field within a single register as shown in the following figure. Field Write Protect bits follow
the same rules as Register Write Protect bits described in
instead applied to each individual field within the register. There is a Field Write Protect bit allocated for
each field within the register.
Figure 310 •
Field Write Protect
22.0.1.3 Bit Write Protect
A Bit Write Protect bit provides write protection for each individual bit within a single register as shown in
the following figure. Bit Write Protect bits follow the same rules as Register Write Protect bits described in
page 670, but are instead applied to each individual bit within the register. There
is a Bit Write Protect bit allocated for each bit within the register.
Figure 311 •
Bit Write Protect
Register Lock Bits Configuration,
page 674 for locking and unlocking registers.
22.0.2
Register Types
There are several register types in the SYSREG block as defined in the following table.
Table 649 •
Register Types
Type
Function
RW-P
Supports read and write accesses via AHB bus matrix. Refer to
page 672. Register contents
are initialized from flash configuration bits at power-up and the assertion of SYS_RESET_N. Typically
used for MSS Control Registers.
32 Flash Bits for Initialization
Write
Protect Bit
Write
Protect Bit
Write
Protect Bit
On Power-Up, Initialize
DFFs with Flash Bits
The write protect bit keeps bus masters from changing the contents
of the Control register.
FLD 1
FLD 2
FLD N
One Write Protect Bit for Each Field
32-Bit Control Register
with Fields
32 Flash Bits for Initialization
32 Write Protect Bits
On Power-Up, Initialize
DFFs with Flash Bits
The write protect bit keeps bus masters from changing the contents of
the Control register.
One Write Protect Bit for Each Bit
32-Bit Control Register
Содержание SmartFusion2 MSS
Страница 1: ...UG0331 User Guide SmartFusion2 Microcontroller Subsystem ...
Страница 166: ...Cortex M3 Processor Reference Material UG0331 User Guide Revision 15 0 132 ...
Страница 200: ...Embedded NVM eNVM Controllers UG0331 User Guide Revision 15 0 166 Figure 87 System Builder Window ...
Страница 407: ...Universal Serial Bus OTG Controller UG0331 User Guide Revision 15 0 373 ...
Страница 806: ...Fabric Interface Controller UG0331 User Guide Revision 15 0 772 Figure 345 FIC Master AHB Lite Subsystem ...