參數(shù)資料
型號(hào): MB89498PFV
廠商: FUJITSU LTD
元件分類: 微控制器/微處理器
英文描述: 8-bit Proprietary Microcontroller CMOS
中文描述: 8-BIT, MROM, 12.5 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, LQFP-100
文件頁數(shù): 20/57頁
文件大小: 341K
代理商: MB89498PFV
MB89490 Series
20
2. Registers
The F
2
MC-8L family has 2 types of registers; dedicated registers in the CPU and general-purpose registers in
the memory. The following registers are provided :
Program counter (PC)
: A 16-bit register for indicating 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 for performing 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 register for indicating a stack area.
Program status (PS)
: A 16-bit register for storing a register pointer and condition code.
The PS can further be divided into higher 8-bit for use as a register bank pointer (RP) and the lower 8-bit for
use as a condition code register (CCR) . (See the diagram below.)
PC
A
T
IX
EP
SP
PS
16-bit
:
Program counter
:
Accumulator
:
Temporary accumulator
: Index register
:
Extra pointer
:
Stack pointer
:
Program status
FFFD
H
Undefined
Undefined
Undefined
Undefined
Undefined
I-flag
=
0, IL1, 0
=
11
Other bits are undefined.
Initial value
Va-
cancy
Va-
cancy
Va-
cancy
H
I
IL1, 0
N
Z
V
C
5
4
RP
PS
10
9
8
7
6
3
2
1
0
15
14
13
12
11
RP
CCR
Structure of the Program Status Register
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