Program Memory - Abov MC80F0304 User Manual

MC80F0304/08/16
At execution of At acceptance At execution At execution
a CALL/TCALL/PCALL of interrupt of RET instruction of RET instruction
01FF PCH Push 01FF PCH 01FF PCH 01FF PCH
01FE PCL down 01FE PCL Push down 01FE PCL up Pop 01FE PCL up Pop
01FD 01FD PSW 01FD 01FD PSW
01FC 01FC 01FC 01FC
SP before execution 01FF 01FF 01FD 01FC
SP after 01FD 01FC 01FF 01FF
execution
At execution At execution
of PUSH instruction PUSH A (X,Y,PSW) of POP instruction POP A (X,Y,PSW)
01FF A down Push 01FF A up Pop 0100 H Stack
01FE 01FD 01FE 01FD depth
01FC 01FC
01FF H
SP before 01FF 01FE
execution
SP after execution 01FE 01FF
Figure 8-4 Stack Operation

8.2 Program Memory

A 16-bit program counter is capable of addressing up to 64K
bytes, but this device has 4K/8K/16K bytes program memory
FFFF space only physically implemented. Accessing a location above will cause a wrap-around to 0000 .
H H C000 H
CPU begins execution from reset vector which is stored in ad- Figure 8-5 , shows a map of Program Memory. After reset, the E000
dress FFFE H and FFFF H as shown in Figure 8-6 . H
As shown in Figure 8-5 , each area is assigned a fixed location in F000 H
Program Memory. Program Memory area contains the user pro-
gram FEFF FF00 H
H
FFDF FFC0 H TCALL area H
FFE0 FFFF Vector Area H H Interrupt
Figure 8-5 Program Memory Map
Page Call (PCALL) area contains subroutine program to reduce
34 November 4, 2011 Ver 2.12