Calculator User Manual

5-1
Program Control
This chapter discusses the processes and features involved in controlling the
flow of a program on the ’C2xx.
Program control involves controlling the order in which one or more blocks of
instructions are executed. Normally, the flow of a program is sequential: the
’C2xx executes instructions at consecutive program-memory addresses. At
times, a program must branch to a nonsequential address and then execute
instructions sequentially at that new location. For this purpose, the ’C2xx sup-
ports branches, calls, returns, repeats, and interrupts.
The ’C2xx also provides a power-down mode, which halts internal program
flow and temporarily lowers the power requirements of the ’C2xx.
Topic Page
5.1 Program-Address Generation 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Pipeline Operation 5-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Branches, Calls, and Returns 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 Conditional Branches, Calls, and Returns 5-10. . . . . . . . . . . . . . . . . . . . . .
5.5 Repeating a Single Instruction 5-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.6 Interrupts 5-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.7 Reset Operation 5-33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.8 Power-Down Mode 5-36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 5