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RL78/G1A CHAPTER 3 CPU ARCHITECTURE
R01UH0305EJ0200 Rev.2.00 93
Jul 04, 2013
Figure 3-36. Example of POP
(SP+1)
SP
F0000H
POP rp
(SP)
SP+1
SP
SP
SP+2
rp
OP-code
<1>
<1>
<2>
<2>
Stack
area
Memory
Stack addressing is specified <1>.
The contents of addresses SP and SP + 1 are stored in the
lower-order and higher-order bytes of the pair of registers
indicated by rp <2>, respectively.
The value of SP <3> is increased by two (if rp is the program
status word (PSW), the content of address SP + 1 is stored in
the PSW).
Instruction code
Figure 3-37. Example of CALL, CALLT
CALL
00H
SP
F0000H
PC
SP
SP㧙1
SP㧙2
SP㧙3
SP㧙4
OP-code
<1>
<1>
<2>
Stack
area
Memory
Instruction code
<3>
Stack addressing is specified <1>. The value of the program
counter (PC) changes to indicate the address of the instruction
following the CALL instruction.
00H, the values of PC bits 19 to 16, 15 to 8, and 7 to 0 are stored
in addresses SP – 1, SP – 2, SP – 3, and SP – 4, respectively <2>.
The value of the SP <3> is decreased by 4.
PC19㧙PC16
PC15㧙PC8
PC7㧙PC0