User guide

Chapter 27
The Status File
27–16
Address Description 5/02
5/01,
Fixed
S:5/8 Memory Module Boot Bit
Read/write. When this bit is set by the processor, it indicates that a
memory module program has been transferred to the processor. This
bit is not cleared by the processor.
Your program can examine the state of this bit every Run mode entry
to determine if the memory module content has been transferred.
S:1/15 will be set to indicate Run mode entry. This information is
useful when you have an application that contains retentive data and
a memory module that has only bit S:1/10 set (load memory module
on NVRAM error). You can use this bit to indicate that retentive data
has been lost. This bit is also helpful when using bits S:1/11 (load
memory module always) or S:1/12 (load memory module always and
run) to distinguish a powerup Run mode entry from a program (or
test) mode to Run mode entry.
• •
S:5/9 Memory Module Password Mismatch Bit
Read/write. This bit is set at Run mode entry, whenever loading from
the memory module is specified (word 1, bits 11 or 12) and the
processor user program is password protected, and the memory
module program does not match that password.
You can use this bit to inform your application program that an
autoloading memory module is installed but did not load due to a
password mismatch.
• •
S:5/10 STI (Selectable Timed Interrupt) Overflow Bit
Read/ write. This bit is set whenever the STI timer expires while the
STI routine is either executing or disabled and the pending bit is
already set.
•
S:5/11 Battery Low Bit
Read only
. This bit is set whenever the Battery Low LED is on; the bit
is cleared when the Battery Low LED is off. It is updated only in the
run or test modes.
•
S:5/12
thru
S:5/15
Reserved
• •