COP8SA-DM National Semiconductor, COP8SA-DM Datasheet - Page 119
COP8SA-DM
Manufacturer Part Number
COP8SA-DM
Description
MODULE DEBUGGING FOR COP8SA
Manufacturer
National Semiconductor
Datasheet
1.DM-COP820D.pdf
(254 pages)
Specifications of COP8SA-DM
Module/board Type
Debugger Module
For Use With/related Products
Cop 8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
*COP8SA-DM
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Syntax:
Description:
Operation:
Instruction
JID
JID
The JID instruction uses the contents of the accumulator to point to an
indirect vector table of program addresses. The contents of the accumu-
lator are transferred to PCL (Lower 8 bits of PC), after which the data
accessed from the program memory location addressed by PC is trans-
ferred to PCL. The program then jumps to the program memory location
accessed by PC. It should be observed that PCU (Upper 7 bits of PC) is
never changed during the JID instruction, so that the Jump Indirect
must jump to a location in the current program memory page of 256 ad-
dresses. However, if the JID instruction is located at the last address of
the page, the PC counter will have already incremented over the page
boundary, and both accesses to program memory (vector table and the
new instruction) will be fetched from the next page of 256 bytes.
PCL <- A
PCL <- Program Memory (PCU,A)
Indirect
Addressing Mode
Instruction
Cycles
COP8SAx7 MICROCONTROLLER
3
Bytes Hex Op Code
1
A5
2-81
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