AT89LP6440 datasheet(19/194 Pages) ATMEL

19 / 194 page

3706A–MICRO–9/09

AT89LP6440 - Preliminary

Figure 3-11. MOVX with One Wait State (WS =01B)

Figure 3-12. MOVX with Two Wait States (WS =10B)

Figure 3-13. MOVX with Three Wait States (WS =11B)

3.4

Extended Stack

The AT89LP6440 provides an extended stack space for applications requiring additional stack

memory. By default the stack is located in the 256-byte IDATA space of internal data memory.

The IDATA stack is referenced solely by the 8-bit Stack Pointer (SP: 81H). Setting the XSTK bit

in AUXR enables the extended stack. The extended stack resides in the EDATA space for up to

4KB of stack memory. The extended stack is referenced by a 12-bit pointer formed from SP and

the four LSBs of the Extended Stack Pointer (SPX: 9EH) as shown in Figure 3-14. SP is shared

between both stacks. Note that the standard IDATA stack will not overflow to the EDATA stack

or vice versa. The stack and extended stack are mutually exclusive and SPX is ignored when

XTSK=0. An application choosing to switch between stacks by toggling XSTK must maintain

CLK

ALE

DPL OUT

P0 SFR

P2 SFR

DPH or P2 OUT

DATA OUT

DPL OUT

P0 SFR

FLOAT

CLK

ALE

DPL OUT

P0 SFR

P2 SFR

DPH or P2 OUT

DATA OUT

DPL OUT

P0 SFR

FLOAT

CLK

ALE

DPL OUT

P0 SFR

P2 SFR

DPH or P2 OUT

DATA OUT

DPL OUT

P0 SFR

FLOAT

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