Electronic Components Datasheet Search |
|
MC-ACT-6809-NET Datasheet(PDF) 4 Page - Actel Corporation |
|
MC-ACT-6809-NET Datasheet(HTML) 4 Page - Actel Corporation |
4 / 7 page Software Compatible 6809 CPU Memec Design February 25, 2003 4 Optimized for Condition Code (CC) Register Beginning with bit(0) the condition code register contains following flags: C: Carry from ALU V: Overflow (2 complement) from ALU Z: Zero from ALU N: Negative (2 complement) from ALU I: Interrupt mask register for irq_n H: Half Carry (low nibble) from ALU F: Interrupt mask for firq_n E: Entire Flag for irq_n/firq_n stack operations Direct Page (DP) Register These registers enhance the direct addressing mode. During direct addressing instruction execution, the contents of DP appears at the higher address outputs (A15- A8). Instructions The MC-ACT-6809 supports all 6809 instructions like load, store, and, or, add, sub, transfer/exchange instructions for all registers, 8 by 8 unsigned multiply, decimal adjust and signed/unsigned conditional branches. A powerful stack command is also available. Software interrupts are supported. Addressing Modes Nearly all instructions can be combined with the following addressing modes: Inherent: Register source and destination, no post bytes, e.g. INCA Immediate: Postbyte is parameter, e.g. LDA #100 Extended: Postbytes are address, e.g. LDA 1000 Direct: Postbyte is low address, DP is high address, e.g. LDA <50 Indexed: Postbyte(s) define indexed mode: - (Index registers are X,Y,U,S) - Post incr. by 1 and 2, e.g. LDA ,S++ - Pre decr. by 1 and 2, e.g. LDA ,-X - Zero offset, e.g. LDA 0,X - signed offset, e.g. LDA -7,Y - A/B/D signed offset, e.g. LDB A,U - 8/16bit signed offset PC relative, e.g. LDA 665,PCR Indexed indirect: The same types as indexed may be used. The indirect mode uses the argument of the index mode as address for an indirect access. Illegal Instructions To insure save operation, illegal opcodes are recognized and will lead to an exception, where a vector is fetched to enter the exception handler routine. For this purpose, the reserved vector of the 6809 is used. The address of the illegal instruction is pushed on the S stack. |
Similar Part No. - MC-ACT-6809-NET |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |