C508 datasheet(17/93 Pages) INFINEON

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C508

Data Sheet

2000-08

CPU

The C508 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 10 MHz external crystal (giving a

20 MHz CPU clock), 58% of the instructions execute in 300 ns. For an 8 MHz crystal, the

corresponding time is 375 ns.

Special Function Register PSW (Address D0H)

Reset Value: 00H

Bit

Function

Carry Flag

Used by arithmetic instructions.

Auxiliary Carry Flag

Used by instructions which execute BCD operations.

General Purpose Flag 0

RS1

RS0

These bits are used to select one of the four register banks.

Overflow Flag

Used by arithmetic instructions.

General Purpose Flag 1

Parity Flag

Set/cleared by hardware after each instruction to indicate an odd/

even number of “one” bits in the accumulator.

RS1

RS0

D0H

PSW

D7H

D6H

D5H

D4H

D3H

D2H

D1H

D0H

Bit No.

MSB

LSB

RS1

RS0

Function

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

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