W65C832_1 Datasheet, PDF (59/64 Pages) –

WDC
THE WESTERN DESIGN CENTER, INC.
W65C832
SECTION 8
CAVEATS
Table 8-1 W65C816 Compatibility Issues
I
I W65C816/802 I W65C02 I NMOS 6502
11. S (Stack)
IAlways page 1 (E=IAlways page l,81Always page 1,8
I
11), 8 bits; 16 Ibits
Ibits
I
Ibits when (E=O) I
I
12. X (X Index Reg)
IIndexed page zerolAlways page 0 IAlways page 0
I
Ialways in page 0 I
I
I
I (E=l), Cross page I
I
I
I (E=O)
I
I
13. Y (Y Index Reg)
IIndexed page zerolAlways page 0 IAlways page 0
I
Ialways in page 0 I
I
I
I (E=l), Cross page I
I
I
I (E=O)
I
I
14. A (Accumulator)
18 bits (M=l), 16 18 bits
18 bits
I
Ibits (M=O)
I
I
15. (Flag Reg)
IN,V, and Z flags IN,V, and ZflagslN,V, and Z flags
I
Ivalid in decimal Ivalid in dec. Iinvalid in
I
I
I
Idecimal
I
Imode. D=O after Imode. D=O after Imode. D=unknown
I
Ireset/interrupt. Ireset/interruptlafter reset. D
I
I
I
Inot modified
I
I
I
Iafter interrupt
I6. Timing
I
I
I
I A. ABS,X ASL, LSR, 17 cycles
16 cycles
17 cycles
I
ROL, ROR With No I
I
I
I
Page Crossing I
I
I
lB. Jump Indirect I
I
I
I
Operand=XXFF
15 cycles
16 cycles
15 cycles and
I
I
I
Iinvalid page
I
I
I
Icrossing
1 C. Branch Across 14 cycles (E=l) 14 cycles
14 cycles
I
Page
13 cycles (E=O) I
I
I D. Decimal Mode
INa add. cycle IAdd 1 cycle INa add. cycle
17. BRK Vector
100FFFE,F (E=l) IFFFE,F BRK bit=IFFFE,F BRK bit=O 1
I
IBRK bit=O on 10 on stack if Ion stack if IRQ-, I
I
Istack if IRQ-, IIRQ-, NMI-. INMI-.
I
I
INMI-,ABORT-.
I
I
I
I
100FFE6,7 (E=O) x=1
I
I
I
IX on Stack always I
I
I
18. Interrupt or Break IPBR not pushed INot available INot available I
I Bank Address
I (E=l), RTI PBR I
I
I
I
Inot pulled (E=l) , I
I
I
I
IPBR pushed (E=O), I
I
I
I
1RTI PBR pulled I
I
I
1
I (E=O)
I
I
I
19. Memory Lock (ML-) IML-=O during ReadIML-=O during INot available I
I
IModify and Write IModify and
I
I
I________________~~----------~--~~----~------------I
MARCH 1990
46