The ADuC834 offers an extended (11-bit) stack pointer that allows the stack to extend into the 2 KBytes of internal XRAM. This can be very useful where embedded functions are used. Issue: If the extended stack pointer is enabled (CFG834.7=1) and the stack points to the extended stack space (SPH》=1) then PUSH direct or POP direct instructions will not operate correctly if the direct address is less than 80H (i.e. not an SFR)。
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