參數(shù)資料
型號(hào)： MTA85811S-04I/SS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20
封裝： 0.209 INCH, PLASTIC, SSOP-20
文件頁(yè)數(shù)： 72/72頁(yè)
文件大小： 760K
代理商： MTA85811S-04I/SS
1995 Microchip Technology Inc.
DS40115C-page 9
MTA85XXX
4.3
Stack
The MTA85XXX employs a two-level hardware PUSH/
POP stack (Figure 4-1 and Figure 4-2).
The CALL instruction pushes the current program
counter value, incremented by one, into stack level 1.
Stack level 1 is automatically pushed to level 2. If more
than 2 subsequent CALLs are executed, only the most
recent two return addresses are stored.
The page preselect bits of the STATUS register will be
loaded into the most significant bits of the program
counter. The ninth bit is always cleared upon a CALL
instruction.
This
means
that
subroutine
entry
addresses have to be located always within the lower
half of a memory page (addresses 000h-0FFh, 200h-
2FFh, 400h-4FFh, 600h-6FFh). However, as the stack
has the same width as the PC, subroutines can be
called from anywhere in the program.
The RETLW instruction loads the contents of the stack
level 1 into the program counter while stack level 2 gets
copied into level 1. If more than 2 subsequent RETLWs
are executed, the stack will be filled with the address
previously stored in level 2. The return will be always to
the page from where the subroutine was called,
regardless of the current setting of the page pre-select
bits in the STATUS register. Note that the W register will
be loaded with the literal value specified in the RETLW
instruction.
This
is
particularly
useful
for
the
implementation of “data” tables within the program
memory.
FIGURE 4-1:
PROGRAM MEMORY
ORGANIZATION MTA854XX
PC
Page 0
000
0FF
100
1FF
18
Stack Level 1
Stack Level 2
RETLW
, CALL
9-bit
A8
A<7:0>
GOTO
... Direct from instruction word
CALL
, Inst with PC as Destination ... Always '0'
GOTO
, CALL ... Direct from Instruction Word
Inst with PC as Destination ... From ALU
FIGURE 4-2:
PROGRAM MEMORY
ORGANIZATION MTA858XX
PC
Page 0
000
0FF
100
1FF
1
8
Stack Level 1
Stack Level 2
RETLW
,
9-11 bit
A8
A<7:0>
GOTO
- Direct from instruction WORD
CALL
, Inst with PC as Destination -
GOTO
, CALL - Direct from Instruction WORD
Inst with PC as Destination - From ALU
A9
A10
CALL
GOTO
, CALL, Inst with PC as destination -
from PA1 (STATUS<6>) (Note1)
GOTO
, CALL, Inst with PC as destination -
from PA0 (STATUS<5>) (Note1)
Always '0'
Page 1
200
2FF
300
3FF
Page 2
400
4FF
500
5FF
Page 3
600
6FF
700
7FF
2
00
01
10
11
Max EPROM
Address for:
PIC16C54A
PIC16C58A
/CR58A
Note 1: PIC16C58A/CR58A only.
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