C868 datasheet(13/82 Pages) INFINEON

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C868

Data Sheet

V 1.0, 2003-05

CPU

The C868 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 10.67 MHz external crystal (giving a

40MHz CPU clock), 58% of the instructions execute in 300 ns.

PSW

Program Status Word Register

[Reset value: 00H]

D7H

D6H

D5H

D4H

D3H

D2H

D1H

D0H

RS1

RS0

rwh

Field

Bits

Typ Description

0rwh 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.

1rw

General Purpose Flag

2rwh Overflow Flag

Used by arithmetic instructions.

RS0

RS1

These bits are used to select one of the four register

banks.

5rw

General Purpose Flag

6rwh Auxiliary Carry Flag

Used by instructions which execute BCD operations.

7rwh Carry Flag

Used by arithmetic instructions.

Table 2 :

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

C868 Datasheet(PDF) 13 Page - Infineon Technologies AG

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