sm59d04g2 SyncMOS Technologies,Inc, sm59d04g2 Datasheet - Page 16

• Manufacturer Part Number: sm59d04g2
• Description: 8-bits Micro-controller 16kb+ Isp Flash & 1kb Ram Embedded
• Manufacturer: SyncMOS Technologies,Inc

3.2.1
Data Memory 00h to FFh is the same as defined in 8052. The address 00h to 7Fh can be accessed
by both direct and indirect addressing modes. Address 00h to 1Fh is register area. Address 20h to
2Fh is memory bit area, and address 30h to 7Fh is for general memory area.
3.2.2
The address 80h to FFh can only be accessed by indirect addressing mode. It is data area.
3.2.3
Address 0000h to 02FFh is the on-chip expanded RAM area, totally 768 bytes. This area can be
accessed by external direct addressing mode with instruction MOVX.
If the address of instruction MOVX @DPTR is larger than 02FFh, then the SM59D04G2 will
generate the external memory control signal automatically. The bit 1 (OME) of SFR BFh (SCONF)
can enable or disable this expanded 768 byte RAM. The default setting of OME bit is 0 (disable).
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M031
Data Memory - Lower 128 byte ($00h to $7Fh)
3.2.2 Data Memory - Higher 128 byte ($80h to $FFh)
3.2.3 Data Memory - Expanded 768 bytes ($0000h to $02FFh)
Fig. 3-2 : RAM architecture
16
16KB+ ISP Flash & 1KB RAM embedded
Ver.C SM59D04G2 07/2009
8-Bits Micro-controller
SM59D04G2