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參數(shù)資料
| 型號： | MB89P955PFM |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 5 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 0.65 MM PITCH, QFP-64 |
| 文件頁數(shù)： | 11/40頁 |
| 文件大?。?/td> | 600K |
| 代理商： | MB89P955PFM |
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MB89950 Series
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2. Registers
The F2MC-8L family has two types of registers; dedicated hardware registers in the CPU and general-purpose
memory registers. The following registers are provided:
Program counter (PC):
A 16-bit register for indicating the instruction storage positions.
Accumulator (A):
A 16-bit temporary register for storing arithmetic operations, etc. When the
instruction is an 8-bit data processing instruction, the lower byte is used.
Temporary accumulator (T):
A 16-bit register which is used for arithmetic operations with the accumulator
When the instruction is an 8-bit data processing instruction, the lower byte is used.
Index register (IX):
A 16-bit register for index modification
Extra pointer (EP):
A 16-bit pointer for indicating a memory address
Stack pointer (SP):
A 16-bit pointer for indicating a stack area
Program status (PS):
A 16-bit register for storing a register pointer, a condition code
The PS can further be divided into higher 8 bits for use as a register bank pointer (RP) and the lower 8 bits for
use as a condition code register (CCR). (See the diagram below.)
PC
A
T
IX
EP
SP
PS
16 bits
: Program counter
: Accumulator
: Temporary accumulator
: Index register
: Extra pointer
: Stack pointer
: Program status
FFFDH
Indeterminate
I-flag = 0, IL1, 0 = 11
The other bit values are Indeterminate.
Initial value
Structure of the Program Status Register
Vacancy
H
I
IL1, 0
N
Z
VC
54
RP
PS
10
9876
3210
15
14
13
12
11
RP
CCR
Vacancy Vacancy
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