Content
Features ............................................................................................................3
Content.............................................................................................................5
1. General Description ....................................................................................9
2. Block Diagram ..........................................................................................10
3. Special Function Register .........................................................................11
3.1.
3.2.
3.3.
3.4.
SFR Map .......................................................................................................................11
SFR Bit Assignment.......................................................................................................12
Auxiliary SFR Map (Page P)..........................................................................................13
Auxiliary SFR Bit Assignment (Page P) .........................................................................14
4. Pin Configurations.....................................................................................15
4.1.
4.2.
Package Instruction .......................................................................................................15
Pin Description ..............................................................................................................16
5. 8051 CPU Function Description................................................................17
5.1.
5.2.
5.3.
CPU Register.................................................................................................................17
CPU Timing ...................................................................................................................19
CPU Addressing Mode ..................................................................................................19
6. Memory Organization................................................................................20
6.1.
6.2.
6.3.
On-Chip Program Flash.................................................................................................20
On-Chip Data RAM........................................................................................................21
Declaration Identifiers in a C51-Compiler.......................................................................23
7. Data Pointer Register (DPTR)...................................................................24
8. System Clock............................................................................................25
8.1.
8.2.
8.3.
Clock Structure..............................................................................................................25
Clock Register ...............................................................................................................26
Clock Sample Code.......................................................................................................28
9. Watch Dog Timer (WDT) ..........................................................................31
9.1.
9.2.
9.3.
9.4.
9.5.
WDT Structure...............................................................................................................31
WDT During Idle and Power Down ................................................................................31
WDT Register................................................................................................................32
WDT Hardware Option...................................................................................................33
WDT Sample Code........................................................................................................34
10. System Reset ...........................................................................................36
10.1. Reset Source.................................................................................................................36
10.2. Power-On Reset............................................................................................................36
10.3. External Reset...............................................................................................................37
10.4. Software Reset..............................................................................................................37
10.5. Illegal Address Reset.....................................................................................................37
10.6. Brown-Out Reset ...........................................................................................................38
10.7. WDT Reset....................................................................................................................38
10.8. Reset Sample Code.......................................................................................................39
11. Power Management..................................................................................40
11.1. Brown-Out Detector.......................................................................................................40
11.2. Power Saving Mode.......................................................................................................40
11.2.1. Slow Mode..................................................................................................................40
11.2.2. Sub-Clock Mode .........................................................................................................40
11.2.3. Watch Mode ...............................................................................................................41
11.2.4. Monitor Mode (L-Series Only).....................................................................................41
11.2.5. Idle Mode....................................................................................................................41
MEGAWIN
MG86FE/L104 Data Sheet
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