SM8958B
8-Bit Micro-controller
32KB Flash
& 1KB RAM embedded
FOSVOS TEL: 021-58998693
Product List.................................................................................................................................................................................... 3
Description..................................................................................................................................................................................... 3
Ordering Information.....................................................................................................................................................................3
Features......................................................................................................................................................................................... 3
Pin Configuration...........................................................................................................................................................................4
Block Diagram............................................................................................................................................................................... 7
Special Function Register (SFR)................................................................................................................................................9
Function Description...................................................................................................................................................................12
1.
General Features......................................................................................................................................................... 12
Embedded Flash.................................................................................................................................................12
IO Pads.................................................................................................................................................................12
System Control Register (SCONF)..................................................................................................................12
Instruction Set...............................................................................................................................................................13
Memory Structure.........................................................................................................................................................17
Program Memory................................................................................................................................................ 17
Data Memory.......................................................................................................................................................18
Data memory - lower 128 byte (00h to 7Fh)...................................................................................................18
Data memory - higher 128 byte (80h to FFh).................................................................................................18
Data memory - Expanded 768 bytes ($0000 to $02FF)...............................................................................18
CPU Engine...................................................................................................................................................................22
Accumulator.........................................................................................................................................................22
B Register............................................................................................................................................................ 22
Program Status Word.........................................................................................................................................23
Stack Pointer....................................................................................................................................................... 23
Data Pointer.........................................................................................................................................................23
GPIO...............................................................................................................................................................................24
Timer 0 and Timer 1.....................................................................................................................................................25
Timer/counter mode control register (TMOD)................................................................................................ 25
Timer/counter control register (TCON)............................................................................................................26
Mode 0 (13-bit Counter/Timer)......................................................................................................................... 26
Mode 1 (16-bit Counter/Timer)......................................................................................................................... 27
Mode 2 (8-bit auto-reload Counter/Timer)...................................................................................................... 27
Mode 3 (Timer 0 acts as two independent 8 bit Timers / Counters)...........................................................27
Timer 2........................................................................................................................................................................... 29
Capture mode......................................................................................................................................................30
Auto-reload (Up or Down Counter).................................................................................................................. 31
Programmable clock out....................................................................................................................................32
Serial interface – UART...............................................................................................................................................34
Serial interface.................................................................................................................................................... 34
1.1
1.2
1.3
2.
3.
3.1
3.2
3.3
3.4
3.5
4.
4.1
4.2
4.3
4.4
4.5
5.
6.
6.1
6.2
6.3
6.4
6.5
6.6
7.
8.
7.1
7.2
7.3
8.1
8.1.1
8.1.2
8.1.3
8.1.4
Mode 0........................................................................................................................................................ 35
Mode 1........................................................................................................................................................ 35
Mode 2........................................................................................................................................................ 36
Mode 3........................................................................................................................................................ 36
8.2
8.3
Multiprocessor Communication of Serial Interface........................................................................................36
Baud Rate Generator.........................................................................................................................................37
8.3.1
8.3.2
8.3.3
Serial interface Mode 0............................................................................................................................ 37
Serial interface Mode 2............................................................................................................................ 37
Serial interface Mode 1 and 3................................................................................................................. 37
9.
10.
11.
Interrupt..........................................................................................................................................................................38
Watch Dog Timer..........................................................................................................................................................40
Power Management Unit.............................................................................................................................................42
11.1
11.2
Idle mode............................................................................................................................................................. 42
Power Down mode............................................................................................................................................. 42
12.
13.
Pulse Width Modulation (PWM).................................................................................................................................44
Two-Wire Series Interface (TWSI).............................................................................................................................46
Operating Conditions................................................................................................................................................................. 49
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M085
Ver A SM8958B 3/7/2014
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