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SM5964 Scheda tecnica(PDF) 7 Page - SyncMOS Technologies,Inc |
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SM5964 Scheda tecnica(HTML) 7 Page - SyncMOS Technologies,Inc |
7 / 26 page SyncMOS Technologies International, Inc. SM5964 8-Bits Micro-controller 64KB ISP flash & 1KB RAM embedded Specifications subject to change without notice contact your sales representatives for the most recent information. Ver 2.2 SM5964 08/2006 7 1.2 Data Memory The SM5964 has 1K bytes on-chip RAM, 256 bytes of it are the same as general 8052 internal memory structure while the expanded 768 bytes on-chip RAM can be accessed by external memory addressing method (by instruction MOVX.). 1.2.1 Data Memory - Lower 128 byte ($00 to $7F) Data Memory $00 to $FF is the same as 8052. The address $00 to $7F can be accessed by direct and indirect addressing modes. Address $00 to $1F is register area. Address $20 to $2F is memory bit area. Address $30 to $7F is for general memory area. 1.2.2 Data Memory - Higher 128 byte ($80 to $FF) The address $80 to $FF can be accessed by indirect addressing mode . Address $80 to $FF is data area. 1.2.3 Data Memory - Expanded 768 bytes ($0000 to $02FF) From external address $0000 to $02FF is the on-chip expanded RAM area, total 768 bytes. This area can be accessed by external direct addressing mode (by instruction MOVX). If the address of instruction MOVX @DPTR is larger than $02FF then SM5964 will generate the external memory control signal automatically. The bit 1 (OME) of special function register $BF (SCONF) can enable or disable this expanded 768 byte RAM. The default setting of OME bit is 1 (enable). |
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