HORNER XL4 - System Registers for Removable Media Interface

MAN0964-14-EN_XL4_XL4P_UM
N o v e m b e r 1 0 , 2 0 2 1 P a g e 155 | 194
16.14 System Registers used with RM
%SR174 – Removable Media Protect. Write a one (1) to %SR174 to prohibit read/write access to
the removable media card. Write a zero (0) to allow access.
%SR175 Status – This shows the current status of the RM interface.
%SR176 Free Space – This 32-bit register shows the free space on the RM card in bytes.
%SR178 Card Capacity – This 32-bit register shows the total card capacity in kilobytes.
Possible status values are shown in the table:
Table 16.3 – RM Status Values
0
RM interface OK
1
Card present but unknown format
2
No card in slot
3
Card present, but not supported
4
Card swapped before operation was complete
5
Unknown error