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PDF STC89C51RD Data sheet ( Hoja de datos )
| Número de pieza | STC89C51RD | |
| Descripción | MCU | |
| Fabricantes | STC MCU | |
| Logotipo |  |
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SSTTCC8899LCE5511DRMRaCCCta/UR/RSDhD+Le+eismtseeirtrieeides.sMMCCUU
STC
STC MCU Limited
www.STCMCU.com
STC MCU Limited.
Update date: 2011-7-25
website：www.STCMCU.com
1 page  
9.3 IAP/EEPROM Assembly Language Program Introduction................206
9.4 EEPROM Demo Program (C and ASM)............................................209
Chapter 10. STC89 series programming tools usage............. 217
10.1 In-System-Programming (ISP) principle..........................................217
10.2 STC89C51RC/RD+ series application circuit for ISP......................218
10.3 PC side application usage.................................................................220
10.4 Compiler / Assembler Programmer and Emulator............................222
10.5 Self-Defined ISP download Demo...................................................222
Appendix A: Assembly Language Programming................... 226
Appendix B: 8051 C Programming.......................................... 248
itedAppendix C: STC89xx series Electrical Characteristics....... 258
LimAppendix D: Program for indirect addressing inner 256B RAM
............................................................................... 260
CUAppendix E: Using Serial port expand I/O interface............. 261
MAppendix F: Use STC MCU common I/O driving LCD Display
STC............................................................................... 263
Appendix G: LED driven by an I/O port and Key Scan......... 270
Appendix H: How to reduce the Length of Code using Keil C...
............................................................................... 271
5 Page 
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Mobile:(86)13922809991
Tel:86-755-82948412
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1.5 STC89C51RC/RD+ series Minimum Application System
1 T2/P1.0
2 T2EX/P1.1
Vcc 40
P0.0 39
Vin
Power On SW1
System power/5V/3V
3 P1.2
4 P1.3
5 P1.4
P0.1 38
P0.2 37
P0.3 36
C6
104
+ C5
10μF
6 P1.5
P0.4 35
10μF +
C1
7 P1.6
8 P1.7
9 RST
P0.5 34
P0.6 33
P0.7 32
10K R1
10 RxD/P3.0
EA/P4.6 31
11 TxD/P3.1
12 INT0/P3.2
13 INT1/P3.3
14 T0/P3.4
15 T1/P3.5
C2<47pF
16 WR/P3.6
17 RD/P3.7
18 XTAL2
X1 19 XTAL1
20 Gnd
C3<47pF
STCAbout reset circuit:
ALE/P4.5 30
PSEN/P4.4 29
P2.7/A15 28
P2.6/A14 27
P2.5/A13 26
P2.4/A12 25
MCUP2.3/A11 24
P2.2/A10 23
P2.1/A9 22
P2.0/A8 21
Limited.
※ How to identify 90C and HD version:
See the the last few letters of the bottom
line of MCU surface text
When the crystal frequency X1 is 4MHz, capacitors C2 and C3 should all be 100pF.
When the crystal frequency X1 is 6MHz, capacitors C2 and C3 should all be 47pF ~ 100pF.
When the crystal frequency X1 is 12~25MHz, capacitors C2 and C3 should all be 47pF.
1. When R/C reset, capacitor C1 is 10uF and resistor R1 isto 10K
2.RC/RD+ series HD version MCU, RESET pin is connected to internal pull-down resistor 45K-100K
About crystals circuit:
OSCDN,Crystal Oscillator Gain Control = full gain
X1 4MHz 6MHz 12M-25MHz 26M-30MHz 31M-35MHz 36M-39MHz
C2, C3 = 100pF 47pF~100pF = 47pF
<= 10pF
<= 10pF
<= 10pF
R1 Invalid Invalid
Invalid
6.8K
5.1K
4.7K
40M-43MHz
<= 10pF
3.3K
44M-48MHz
<= 5pF
3.3K
OSCDN(OSC Control),Crystal Oscillator Gain Control = 1/2 gain
X1 4MHz 6MHz 12M-25MHz 26M-30MHz 31M-35MHz 36M-39MHz 40M- 43MHz 44M- 48MHz
C2, C3 = 100pF 47pF~100pF = 47pF
<= 10pF
Invalid
Invalid
Invalid
Invalid
R1 Invalid Invalid
Invalid
6.8K
5.1K
4.7K
3.3K
3.3K
STC MCU Limited.
website：www.STCMCU.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet STC89C51RD.PDF ] | |
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