Specifications

Programmers Model
ARM DUI 0447J Copyright © 2009-2014, ARM. All rights reserved. 4-13
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Table 4-8 shows the Flag registers.
The board provides the following distinct types of flag register:
• The SYS_FLAGS Register is cleared by a normal reset, such as a reset caused by pressing
the reset button.
• The SYS_NVFLAGS Register retains its contents after a normal reset and is only cleared
by a Power-On Reset (POR).
Flag and Nonvolatile Flag Registers
The SYS_FLAGS and SYS_NVFLAGS registers contain the current state of the flags.
Flag and Nonvolatile Flag Set Registers
The SYS_FLAGSSET and SYS_NVFLAGSSET registers set bits in the SYS_FLAGS and
SYS_NVFLAGS registers:
• Write 1 to SET the associated flag.
• Write 0 to leave the associated flag unchanged.
Flag and Nonvolatile Flag Clear Registers
Use the SYS_FLAGSCLR and SYS_NVFLAGSCLR registers to clear bits in the SYS_FLAGS
and SYS_NVFLAGS registers:
• Write 1 to CLEAR the associated flag.
• Write 0 to leave the associated flag unchanged.
4.4.6 MCI Register
The SYS_MCI Register characteristics are:
Purpose Provides status information on the MultiMedia card socket
Usage constraints There are no usage constraints.
Configurations Available in all configurations.
Attributes See Table 4-3 on page 4-8.
Figure 4-6 on page 4-14 shows the bit assignments.
Table 4-8 Flag registers
Register Address offset Access Reset by Description
SYS_FLAGS
0x0030 Read Reset Flag register
SYS_FLAGSSET
0x0030 Write Reset Flag Set register
SYS_FLAGSCLR
0x0034 Write Reset Flag Clear register
SYS_NVFLAGS
0x0038 Read POR Nonvolatile Flag register
SYS_NVFLAGSSET
0x0038 Write POR Nonvolatile Flag Set register
SYS_NVFLAGSCLR
0x003C Write POR Nonvolatile Flag Clear register