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SAF-C505-2RM Datasheet(PDF) 14 Page - Siemens Semiconductor Group

Part # SAF-C505-2RM
Description  8-Bit CMOS Microcontroller
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

SAF-C505-2RM Datasheet(HTML) 14 Page - Siemens Semiconductor Group

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Semiconductor Group
14
1997-12-01
C505 / C505C
C505A / C505CA
CPU
The C505 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 crystal, 58% of the instructions are executed in 375 ns.
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.
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
RS1
RS0
Function
0
0
Bank 0 selected, data address 00H-07H
0
1
Bank 1 selected, data address 08H-0FH
1
0
Bank 2 selected, data address 10H-17H
1
1
Bank 3 selected, data address 18H-1FH


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