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參數(shù)資料
| 型號： | MB89538H |
| 廠商： | Fujitsu Limited |
| 英文描述： | 8-bit Original Microcontroller CMOS |
| 中文描述： | 8位微控制器的CMOS原件 |
| 文件頁數(shù)： | 22/56頁 |
| 文件大?。?/td> | 456K |
| 代理商： | MB89538H |
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MB89530H Series
22
2.
Registers
The F
2
MC-8L series has two types of registers, dedicated-use registers within the CPU, and general-purpose
registers in memory.
Program counter (PC)
: 16-bit length, shows the location where instructions are stored.
Accumulator (A)
: 16-bit length, a temporary memory register for calculation operations.
The lower byte is used for 8-bit data processing instructions.
Temporary accumulator (T) : 16-bit length, performs calculations with the accumulator.
The lower byte is used for 8-bit data processing instructions.
Index register (IX)
: 16-bit length, a register for index modification.
Extra pointer (EP)
: 16-bit length, a pointer indicating memory addresses.
Stack pointer (SP)
: 16-bit length, indicates stack areas.
Program status (PS)
: 16-bit length, contains register pointer and condition code.
In addition, the PS register can be divided so that the upper 8 bits are used as a register bank pointer (RP), and
the lower 8 bits as a condition code register (CCR). (See the following illustration.)
PC
A
T
IX
EP
SP
PS
16 bits
: Program counter
: Accumulator
: Temporary accumulator
: Index register
: Extra pointer
: Stack pointer
: Program status
FFFD
H
Initial value
Not fixed
Not fixed
Not fixed
Not fixed
Not fixed
I-flag
=
0, IL1, 0
=
11
Other bits not fixed
Program status register configuration
PS
RP
CCR
15
14
13
12
11
10
Open Open Open
9
8
7
6
5
4
3
2
1
0
RP
H
I
IL1
IL0
N
Z
V
C
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