參數(shù)資料
型號： MC68HC05X4
廠商： Motorola, Inc.
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 30/156頁
文件大?。?/td> 926K
代理商： MC68HC05X4
CPU
MC68HC05X4
30
CPU
MOTOROLA
Program Counter
The program counter is a 16-bit register that contains the address of the
next instruction or operand to be fetched. The two most significant bits
of the program counter are ignored internally.
Normally, the address in the program counter automatically increments
to the next sequential memory location every time an instruction or
operand is fetched. Jump, branch, and interrupt operations load the
program counter with an address other than that of the next sequential
location.
Condition Code
Register
The condition code register is an 8-bit register whose three most
significant bits are permanently fixed at 111. The condition code register
contains the interrupt mask and four flags that indicate the results of the
instruction just executed. The following paragraphs describe the
functions of the condition code register.
Half-Carry Flag
The CPU sets the half-carry flag when a carry occurs between bits 3 and
4 of the accumulator during an ADD or ADC operation. The half-carry
flag is required for binary-coded decimal (BCD) arithmetic operations.
Interrupt Mask
Setting the interrupt mask disables interrupts. If an interrupt request
occurs while the interrupt mask is logic zero, the CPU saves the CPU
registers on the stack, sets the interrupt mask, and then fetches the
Bit 15 14
13
12
11
10
9
8
7
6
5
4
3
2
1
Bit 0
–
–
Reset
–
–
Loaded with vector from $3FFE AND $3FFF
Figure 5. Program Counter
Bit 7
6
5
4
3
2
1
Bit 0
1
1
1
H
I
N
C
Z
Reset
1
1
1
U
1
U
U
U
Figure 6. Condition Code Register
4-cpu
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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MC68HC05X4CDW 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
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