參數(shù)資料
型號: SAB-C505C-LM
廠商: SIEMENS A G
元件分類: 微控制器/微處理器
英文描述: 8-Bit CMOS Microcontroller
中文描述: 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
封裝: PLASTIC, MQFP-44
文件頁數(shù): 16/85頁
文件大?。?/td> 487K
代理商: SAB-C505C-LM
C505L
Data Sheet
14
06.99
CPU
The C505L 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 16-MHz external clock, 58% of the instructions execute in 375 ns (20 MHz:
300 ns).
Special Function Register PSW (Address D0
H
)
ResetValue:00
H
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.
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
D0
H
PSW
D7
H
D6
H
D5
H
D4
H
D3
H
D2
H
D1
H
D0
H
Bit No.
MSB
LSB
RS1
RS0
Function
0
0
Bank 0 selected, data address 00
H
-07
H
Bank 1 selected, data address 08
H
-0F
H
Bank 2 selected, data address 10
H
-17
H
Bank 3 selected, data address 18
H
-1F
H
0
1
1
0
1
1
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