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| 型號(hào)： | HMS81020TL |
| 廠商： | Hynix Semiconductor Inc. |
| 元件分類(lèi)： | 8位微控制器 |
| 英文描述： | HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | Hynix半導(dǎo)體公司的8位單芯片微控制器 |
| 文件頁(yè)數(shù)： | 20/77頁(yè) |
| 文件大?。?/td> | 1112K |
| 代理商： | HMS81020TL |
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HMS81004E/08E/16E/24E/32E
JUNE 2001 Ver 1.00
17
used.
Figure 8-3 Stack Operation
Program Counter:
The Program Counter is a 16-bit wide which consists of
two 8-bit registers, PCH and PCL. This counter indicates
the address of the next instruction to be executed. In reset
state, the program counter has reset routine address
(PC
H
:0FF
H
, PC
L
:0FE
H
).
Program Status Word:
The Program Status Word (PSW) contains several bits that
reflect the current state of the CPU. The PSW is described
in Figure 8-4 . It contains the Negative flag, the Overflow
flag, the Break flag the Half Carry (for BCD operation),
the Interrupt enable flag, the Zero flag, and the Carry flag.
[Carry flag C]
This flag stores any carry or borrow from the ALU of CPU
after an arithmetic operation and is also changed by the
Shift Instruction or Rotate Instruction.
SP
01
H
Stack Address ( 100
H
~ 1FF
H
)
8
15
0
7
Hardware fixed
Caution:
The Stack Pointer must be initialized by software be-
cause its value is undefined after RESET.
Example: To initialize the SP
LDX
TXSP
#0FFH
; SP
←
FF
H
At execution of
a CALL/TCALL/PCALL
PCL
PCH
01FF
SP after
execution
SP before
execution
01FD
01FE
01FD
01FC
01FF
Push
down
At acceptance
of interrupt
PCL
PCH
01FF
01FC
01FE
01FD
01FC
01FF
Push
down
PSW
At execution
of RET instruction
PCL
PCH
01FF
01FF
01FE
01FD
01FC
01FD
Pop
up
At execution
of RETI instruction
PCL
PCH
01FF
01FF
01FE
01FD
01FC
01FC
Pop
up
PSW
0100H
01FFH
Stack
depth
At execution
of PUSH instruction
PUSH A (X,Y,PSW)
A
01FF
01FE
01FE
01FD
01FC
01FF
Push
down
SP after
execution
SP before
execution
At execution
of POP instruction
POP A (X,Y,PSW)
A
01FF
01FF
01FE
01FD
01FC
01FE
Pop
up
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