SM39R08A3 Datasheet, PDF (20/88 Pages) SyncMOS Technologies,Inc – One serial peripheral interfaces in full duplex mode

3. Memory Structure
SM39R08A3
8-Bit Micro-controller
with 8KB+1KB ISP Flash
& 512B RAM embedded
The SM39R08A3 memory structure follows general 8052 structure. It is 8KB+1KB program memory.
3.1 Program Memory
The SM39R08A3 has 8KB+1KB on-chip flash memory which can be used as general program memory or EEPROM,
on which include up to 1K byte specific ISP service program memory space. The address range for the 8K byte is
$0000 to $1FFF. The address range for the ISP service program is $3C00 to $3FFF. The ISP service program size can
be partitioned as N blocks of 128 byte (N=0 to 8). When N=0 means no ISP service program space available, total
8KB+1KB memory used as program memory. When N=1 means address $3F80 to $3FFF reserved for ISP service
program. When N=2 means memory address $3F00 to $3FFF reserved for ISP service program…etc. Value N can be
set and programmed into SM39R08A3 by the writer or ICP. It can be used to record any data as EEPROM(If you need
modify the data on program memory, please page erase first ). The procedure of this EEPROM application function is
described in the section 18 on internal ISP.
ISP service
Program space,
Up to 1K
3FFF
3F80
3F00
3E80
3E00
3D80
3D00
3C80
3C00
N=0
N=1
N=2
N=3
N=4
N=5
N=6
N=7
N=8
1FFF
8K Program
Memory space
0000
Fig. 3-1: SM39R08A3 programmable Flash
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M063
Ver F SM39R08A3 06/30/2015
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