SM39R4051/SM39R2051
8-Bit Micro-controller
4KB/2KB with ISP Flash
& 256B RAM embedded
FOSVOS TEL: 021-58998693
Description..........................................................................................................................................................................3
Features..............................................................................................................................................................................3
Pin Configuration ................................................................................................................................................................4
Block Diagram.....................................................................................................................................................................5
Pin Description....................................................................................................................................................................6
Special Function Register (SFR) ........................................................................................................................................7
Function Description...........................................................................................................................................................9
1.
General Features .......................................................................................................................................................9
1.1.
1.2.
1.3.
1.4.
Embedded Flash...........................................................................................................................................9
IO Pads .........................................................................................................................................................9
Instruction timing Selection...........................................................................................................................9
RESET ........................................................................................................................................................10
1.4.1.
Hardware RESET function.............................................................................................................10
Software RESET function ..............................................................................................................10
Time Access Key register (TAKEY)................................................................................................10
Software Reset register (SWRES).................................................................................................11
Example of software reset .............................................................................................................11
1.4.2.
1.4.3.
1.4.4.
1.4.5.
1.5.
Clocks .........................................................................................................................................................11
2.
3.
Instruction Set ..........................................................................................................................................................12
Memory Structure.....................................................................................................................................................16
3.1.
3.2.
Program Memory ........................................................................................................................................16
Data Memory...............................................................................................................................................17
3.2.1.
3.2.2.
Data memory - lower 128 byte (00h to 7Fh)..................................................................................18
Data memory - higher 128 byte (80h to FFh) ................................................................................18
4.
CPU Engine .............................................................................................................................................................19
4.1.
4.2.
4.3.
4.4.
4.5.
4.6.
4.7.
Accumulator ................................................................................................................................................19
B Register ...................................................................................................................................................19
Program Status Word..................................................................................................................................20
Stack Pointer...............................................................................................................................................20
Data Pointer ................................................................................................................................................20
Data Pointer 1 .............................................................................................................................................21
Interface control register .............................................................................................................................21
5.
6.
GPIO ........................................................................................................................................................................22
Timer 0 and Timer 1.................................................................................................................................................24
6.1.
6.2.
6.3.
Timer/counter mode control register (TMOD).............................................................................................24
Timer/counter control register (TCON) .......................................................................................................25
T0、T1 signal swapping：..........................................................................................................................25
7.
Serial interface 0 ......................................................................................................................................................26
7.1.
7.2.
7.3.
7.4.
7.5.
7.6.
Mode 0 ........................................................................................................................................................27
Mode 1 ........................................................................................................................................................27
Mode 2 ........................................................................................................................................................28
Mode 3 ........................................................................................................................................................28
Multiprocessor communication of Serial Interface 0...................................................................................28
Baud rate generator....................................................................................................................................29
7.6.1.
7.6.2.
Serial interface 0 modes 1 and 3 ...................................................................................................29
Clock source for baud rate.............................................................................................................29
8.
9.
Watchdog timer ........................................................................................................................................................30
Interrupt....................................................................................................................................................................33
9.1.
Priority level structure..................................................................................................................................35
Power Management Unit.................................................................................................................................36
Idle mode................................................................................................................................................36
Stop mode...............................................................................................................................................36
IIC function ......................................................................................................................................................37
LVI – Low Voltage Interrupt .............................................................................................................................41
In-System Programming (Internal ISP) ...........................................................................................................42
ISP service program ...............................................................................................................................42
Lock Bit (N).............................................................................................................................................42
10.
10.1.
10.2.
11.
12.
13.
13.1.
13.2.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M055 Ver.E SM39R4051 09/2011
1
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