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ST63126 Datasheet(PDF) 13 Page - STMicroelectronics |
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ST63126 Datasheet(HTML) 13 Page - STMicroelectronics |
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13 / 86 page  ST631xxx CORE (Continued) Stack The ST631xx Core includes true LIFO hardware stack that eliminates the need for a stack pointer. The stack consists of six separate 12-bit RAM loca- tions that do not belong to the data space RAM area. When a subroutine call (or interrupt request) occurs, the contents of each level is shifted into the next level while the content of the PC is shifted into the first level (the value of the sixth level will be lost). When subroutine or interrupt return occurs (RET or RETI instructions), the first level register is shifted back into the PC and the value of each level is shifted back into the previous level. These two operating modes are described in Figure 6. Since the accumulator, as all other data space registers, is not stored in this stack the handling of this regis- ters shall be performed inside the subroutine. The stack pointer will remain in its deepest position, if more than 6 calls or interrupts are executed, so that the last return address will be lost. It will also remain in its highest position if the stack is empty and a RET or RETI is executed. In this case the next instruction will be executed. WHEN CALL OR INTERRUPT REQUEST OCCURS STACK LEVEL 1 STACK LEVEL 1 STACK LEVEL 1 STACK LEVEL 1 STACK LEVEL 1 STACK LEVEL 1 PROGRAM COUNTER RET OR RETI WHEN OCCURS VA000424 Figure 6. Stack Operation ® ST63140,142,126,156 9/82 |
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