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PDF STC90LE51RC Data sheet ( Hoja de datos )
| Número de pieza | STC90LE51RC | |
| Descripción | MCU | |
| Fabricantes | STC MCU | |
| Logotipo |  |
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www.STCMCU.com
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Tel:86-755-82948412
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STC MCU Limited
www.STCMCU.com
STC MCU Limited.
Update date: 2011-7-26
website：www.STCMCU.com
1 page  
Chapter 10. STC90 series programming tools usage............. 215
10.1 In-System-Programming (ISP) principle..........................................215
10.2 STC90C51RC/RD+ series application circuit for ISP......................216
10.3 PC side application usage.................................................................218
10.4 Compiler / Assembler Programmer and Emulator............................220
10.5 Self-Defined ISP download Demo...................................................220
Appendix A: Assembly Language Programming................... 224
Appendix B: 8051 C Programming.......................................... 246
Appendix C: STC90xx series Electrical Characteristics....... 256
itedAppendix D: Program for indirect addressing inner 256B RAM
............................................................................... 258
LimAppendix E: Using Serial port expand I/O interface............. 259
CUAppendix F: Use STC MCU common I/O driving LCD Display
M............................................................................... 261
Appendix G: LED driven by an I/O port and Key Scan......... 268
STCAppendix H: How to reduce the Length of Code using Keil C...
............................................................................... 269
5 Page 
www.STCMCU.com
Mobile:(86)13922809991
Tel:86-755-82948412
1.6 STC90C51RC/RD+ series Application Circuit for ISP
Fax:86-755-82905966
Vcc STC3232,STC232,MAX232,SP232
PC COM
1 C1+
0.1μF 2 V+
Vcc 16 +
Gnd 15
Vcc
Gnd
2
3
3 C1-
T1OUT 14 PC_RxD(COM Pin2)
5
4 C2+
R1IN 13 PC_TxD(COM Pin3)
5 C2-
R1OUT 12
6 V-
7 T2OUT
8 R2IN
T1IN 11
T2IN 10
R2OUT 9
This part of the circuit
has nothing to do
with the downloads
U1-P1.0
U1-P1.1
MCU-VCC
U1-P3.0
U1-P3.1
Gnd
STC10μF + C1
10K R1
Vcc
1K
1 T2/P1.0
2 T2EX/P1.1
MCU3 P1.2
4 P1.3
5 P1.4
6 P1.5
7 P1.6
8 P1.7
MCU_RxD(P3.0)
MCU_TxD(P3.1)
9 RST
10 RxD/P3.0
11 TxD/P3.1
If the frequency of external clock is higher
than 33MHz, external active crystal
oscillator is recommended to use directly.
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
USB+5V T1OUT R1IN GND
X1
18 XTAL2
19 XTAL1
USB1
C1<47pF
20 Gnd
System Power/USB +5V
SW1
Power On
Limited.※ STC90xx Series can directly
substitute STC89xx Series
Vcc 40
P0.0 39
P0.1 38
1K
C6
P0.2 37
104
P0.3 36
P0.4 35
P0.5 34
P0.6 33
P0.7 32
EA/P4.6 31
ALE/P4.5 30
PSEN/P4.4 29
P2.7/A15 28
1K
P2.6/A14 27
P2.5/A13 26
P2.4/A12 25
P2.3/A11 24
P2.2/A10 23
P2.1/A9 22
P2.0/A8 21
+ C5
10μF
About reset circuit:
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
STC MCU Limited.
website：www.STCMCU.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet STC90LE51RC.PDF ] | |
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