SM59A16U1
8-Bit Micro-controller
64KB with ISP Flash
& 6K+256B RAM embedded
3.2
Data Memory
The SM59A16U1 has 6K+256B on-chip SRAM, 256 Bytes of it are the same as general 8052 internal memory
structure while the expanded 6K Bytes on-chip SRAM can be accessed by external memory addressing method( by
instruction MOVX.). As shown in Fig. 3-2、Fig. 3-3 and Fig. 3-4
Fig. 3-2: (a)External memory access as read
Fig. 3-3: (b)External memory access as write
07FF
Expanded 6K Bytes
(Accessed by direct external
addressing mode by
FF
FF
80
instruction MOVX)
Higher 128 Bytes (Accessed by
indirect addressing mode only)
SFR (Accessed by direct addressing
mode only)
80
7F
Lower 128 Bytes (Accessed by direct
& indirect addressing mode )
0000
00
Fig. 3-4: RAM architecture
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M071 Ver A SM59A16U1 04/12/2013
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SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
