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参数资料
| 型号： | C541U |
| 厂商： | SIEMENS AG |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8 BIT CMOS MICROCONTROLLER |
| 中文描述： | 8位CMOS单片机 |
| 文件页数： | 12/63页 |
| 文件大小： | 497K |
| 代理商： | C541U |
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Semiconductor Group
10
C541U
CPU
The C541U is efficient both as a controller and as an arithmetic processor. It has extensive facilities
for binary and BCD arithmetic and excels in its bit-handling capabilities. Efficient use of program
memory results from an instruction set consisting of 44 % one-byte, 41 % two-byte, and 15% three-
byte instructions. With a 12 MHz crystal, 58% of the instructions are executed in 500ns.
Special Function Register PSW (Address D0H)
Reset Value : 00H
Bit
Function
CY
Carry Flag
Used by arithmetic instruction.
AC
Auxiliary Carry Flag
Used by instructions which execute BCD operations.
F0
General Purpose Flag
RS1
RS0
Register Bank Select Control Bits
These bits are used to select one of the four register banks.
RS1
RS0
Function
OV
Overflow Flag
Used by arithmetic instruction.
F1
General Purpose Flag
P
Parity Flag
Set/cleared by hardware after each instruction to indicate an odd/even
number of "one" bits in the accumulator, i.e. even parity.
CY
AC
F0
RS1
RS0
OV
F1
P
D0H
PSW
D7H
D6H
D5H
D4H
D3H
D2H
D1H
D0H
Bit No.
MSB
LSB
0
0
Bank 0 selected, data address 00H-07H
Bank 1 selected, data address 08H-0FH
Bank 2 selected, data address 10H-17H
Bank 3 selected, data address 18H-1FH
0
1
1
0
1
1
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