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MC-ACT-6809-VHD bảng dữ liệu(PDF) 4 Page - Actel Corporation

tên linh kiện MC-ACT-6809-VHD
Giải thích chi tiết về linh kiện  SoftwareCompatible6809CPU
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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.


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