SDA55XX Datasheet, PDF (113/230 Pages) Infineon Technologies AG – Preliminary & Confidential

SDA 55xx
Preliminary & Confidential
Memory Organization
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There are two modes for MOVC instructions. The mode is selected by MM bit in MEX2.
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When MM bit =’0’, MOVC will access the current bank. The CB16...CB19 bits would
appear as address A16...A19 during MOVC instructions.
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When MM bit =’1’, MOVC will access the Memory bank. The MB16...MB19 bits would
appear as address A16...A19 during MOVC instructions. Note: MEX1 is not destroyed.
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There are two modes for MOVX instructions. The mode is selected by MXM bit in MEX3.
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When MXM bit =’0’, MOVX will access the current bank. The CB16...CB19 bits would
appear as address A16...A19 during MOVX instructions.
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When MXM bit =’1’, MOVX will access the Data memory bank. The MX16...MX19 bits
would appear as address A16...A19 during MOVX instructions. Note: MEX1 is not
destroyed.
10.3.4 CALLs and Interrupts
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For Interrupts and Calls Memory extension Stack is required. Stack pointer MEXSP
provides the stack depth of up to 128bytes. Stack width is 1 byte. In TVT Pro 128 Bytes
stack is implemented.
*Target
10.3.5 Stack Full
No indication for stack full is provided.User is responsible to read MEXSP SFR to
determine the status of the MEXSP stack.
10.3.6 Timing
MMU outputs address bits A19...A16 at the same time as normal addresses A15...A0.
Semiconductor Group
113
User’s Manual July 99