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SM5964 Datasheet(PDF) 7 Page - SyncMOS Technologies,Inc |
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SM5964 Datasheet(HTML) 7 Page - SyncMOS Technologies,Inc |
7 / 28 page July 2002 Specifications subject to change without notice,contact your sales representatives for the most recent information. 7/28 PID 5964 07/02 SyncMOS Technologies Inc. SM5964 Ver 1.0 1.2.1 Data Memory - Lower 128 byte ($00 to $7F, Bank 0 & Bank 1) 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, Bank 2 & Bank 3) The address $80 to $FF can be accessed by indirect addressing mode or by bank mapping direct addressing mode. Address $80 to $FF is data area. 1.2.3 Data Memory - Expanded 768 bytes ($0000 to $02FF, Bank 4 ~ Bank 15) 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) or by bank mapping direct addressing mode. 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). The address space of instruction MOVX @Ri, i=0,1 is determined by bit 1 & bit 0 (RAMS1, RAMS0) of special function reg- ister $85 (RCON). The default setting of RAMS1, RAMS0 bits is 00 (page0). One page of data RAM is 256 byte. RAMS1, RAMS0=00, Rn of instruction MOVX @Ri, i=0,1 mapping to expanded RAM address $0000 to $00FF (page 0) RAMS1, RAMS0=01, Rn of instruction MOVX @Ri, i=0,1 mapping to expanded RAM address $0100 to $01FF (page 1) RAMS1, RAMS0=10, Rn of instruction MOVX @Ri, i=0,1 mapping to expanded RAM address $0200 to $02FF (page 2) RAMS1, RAMS0=11, Rn of instruction MOVX @Ri, i=0,1 mapping to expanded RAM address $XY00 to $XYFF which high byte address specified by port 2. (SM5964 will generate the external memory control signal automatically). FF 80 7F 00 FF 80 Expanded 768 byte (Accessed direct external addressing by instruction MOVX) 02FF 0000 Higher 128 byte (Accessed by indirect addressing mode only) SFR (Accessed by direct addressing mode only) Lower 128 byte (Accessed by direct & indirect by mode, addressing mode) (OME = 1) |
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