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CHAPTER 5 CPU ARCHITECTURE
104
(3) Stack pointer (SP)
This is a 16-bit register to hold the start address of the memory stack area. Only the internal high-speed RAM
area can be set as the stack area. Internal high-speed RAM of each product is as follows.
µ
PD78011B, 78011BY, 78012B, 78012BY: FD00H to FEFFH
µ
PD78013, 78013Y, 78014, 78014Y, 78P014, 78P014Y: FB00H to FEFFH
Figure 5-8. Stack Pointer Configuration
The SP is decremented ahead of write (save) to the stack memory and is incremented after read (reset) from
the stack memory.
Each stack operation saves/resets data as shown in Figures 5-9 and 5-10.
Caution
Since SP contents will be undefined by RESET input, be sure to initialize the SP before instruction
execution.
15
0
SP
SP15 SP14 SP13 SP12 SP11 SP10 SP9 SP8
SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
Summary of Contents for 78014Y Series
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