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Handshake Solutions
HT80C51 User Manual
Memory Organization – Internal Data Memory: Direct and Indirect Address Area
Page 12 of 132
© Philips Electronics N.V. 2005
able by most assemblers. One way is to refer to their address (i.e., 0-7FH). The other way is with ref-
erence to bytes 20H to 2FH. Thus, bits 0-7 can also be referred to as bits 20.0-20.7, and bits 8-FH
are the same as 21.0-21.7, and so on. Each of the 16 bytes in this segment can also be addressed
as a byte.
3. Scratch Pad Area:
30H through 7FH are available to the user as data RAM. However, if the stack pointer has been initial-
ized to this area, enough bytes should be left aside to prevent overwriting of stack data.
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