PIC16LF1508 Datasheet, PDF (37/384 Pages) Microchip Technology – 20-Pin Flash, 8-Bit Microcontrollers with nanoWatt XLP Technology

PIC16(L)F1508/9
FIGURE 3-6:
ACCESSING THE STACK EXAMPLE 2
TOSH:TOSL
0x0F
0x0E
0x0D
0x0C
0x0B
0x0A
0x09
0x08
0x07
0x06
0x05
0x04
0x03
0x02
0x01
0x00
Return Address
This figure shows the stack configuration
after the first CALL or a single interrupt.
If a RETURN instruction is executed, the
return address will be placed in the
Program Counter and the Stack Pointer
decremented to the empty state (0x1F).
STKPTR = 0x00
FIGURE 3-7:
ACCESSING THE STACK EXAMPLE 3
TOSH:TOSL
0x0F
0x0E
0x0D
0x0C
0x0B
0x0A
0x09
0x08
0x07
0x06
0x05
0x04
0x03
0x02
0x01
0x00
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
After seven CALLs or six CALLs and an
interrupt, the stack looks like the figure
on the left. A series of RETURN instructions
will repeatedly place the return addresses
into the Program Counter and pop the stack.
STKPTR = 0x06
 2011 Microchip Technology Inc.
Preliminary
DS41609A-page 37