Chapter 5: CPU Operation and Memory 37
Absolute Address Designation
In LDR, DLDR, STO, DSTO instructions, the absolute address is used to perform indirect memory
operations using pointers. The absolute address is also used by the D50 program loader port protocol
for reading and writing memory areas.
Absolute Address Absolute Address
Register
Address
Dec. Hex.
Register
Address
Dec. Hex.
R0000 0 0000 W0000 512 0200
R0001 1 0001 W0001 513 0201
R0002 2 0002 W0002 514 0202
::: :::
R0028 28 001C W0254 766 02FE
External
I/O
R0029 29 001D
Data
Words
W0255 767 02FF
M0000 192 00C0 SV000 512 0200
M0001 193 00C1 SV001 2560 0A00
M0002 194 00C2 : : :
:::
T/C Set
Value
SV255 2815 0AFF
M0030 222 00DE PV000 2816 0B00
Internal
Contact
M0031 223 00DF PV001 2817 0B01
K0000 320 0140 : : :
K0001 321 0141
T/C
Present
Value
PV255 3071 0BFF
K0002 322 0142 SR000 3072 0C00
K0003 323 0143 SR001 3073 0C01
::: :::
K0014 334 014E SR254 3326 0CFE
Internal
Keep
Contact
K0015 335 014F
System
Registers
SR255 3327 0CFF
When accessing a bit absolute address using the program loader port communications protocol, the bit
address (0 to 15) is kept separate from the word address (as shown below).
1 word display
For example, the absolute bit address for K012.12 internal contact is $14CC (hex).
(word absolute address = $014C + bit number = $C = $14CC)
Refer to the appendix for a detailed explanation of the communications protocol.
Word absolute address bit number
15 4 3 0
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
