STC micro STC8A8K64D4 Series Reference Manual page 24

STC8A8K64D4 Series Manual
ADC_ETR/ECI/T2/SS/PWM2_2/ADC2/P1.2
CCP3/I2CSDA/MISO/PWM4_2/ADC4/P1.4
CCP2/I2CSCL/SCLK/PWM5_2/ADC5/P1.5
XTALO/CCP1/MCLKO_2/PWM6_2/RxD_3/ADC6/P1.6
XTALI/CCP0/PWM7_2/TxD_3/ADC7/P1.7
Note:
If USB download is not required,
P3.0/P3.1/P3.2 cannot be low at the
same time when the chip is reset,
otherwise, the chip will always be
in USB download mode without
running user code.
Typical download circuit
ISP download steps:
1. Connect the universal USB to UART tool to the target chip according to the connection method shown in the figure
above.
2. Press the power button to confirm that the target chip is in a power-off state (the power-on LED is off).
Note: When the tool is powered on for the first time, there is no external power supply, so if it is the first time to
use this tool, you can skip this step.
3. Click the "Download/Program" button in the STC-ISP download software.
4. Press the power button again to power on the target chip (the power-on LED is on).
5. Start ISP download.
Note: It has been found that when using the USB cable for ISP download, if the USB cable is too thin and the
voltage drop on the USB cable is too large, this will result in insufficient power supply during the ISP download.
Therefore, please be sure to use the booster USB cable for ISP download.
TxD4/ADC11/AD3/P0.3
T3/ADC12/AD4/P0.4
T3CLKO/ADC13/AD5/P0.5
T4/ADC14/AD6/P0.6
T4CLKO/AD7/P0.7
RxD2/PWM0_2/ADC0/P1.0
TxD2/PWM1_2/ADC1/P1.1
T2CLKO/MOSI/PWM3_2/ADC3/P1.3
ADC_AGnd
AVref
ADC_AVcc
MCLKO/NRST/P5.4
1
40
2 39
3 38
4
37
5
36
6
35
7
34
8
33
9
32
10
31
11
30
12
29
13
28
14
27
15
26
16
25
17
24
Vcc 18
23
P5.5 19
22
Gnd 20
21
-
P0.2/AD2/ADC10/RxD4
P0.1/AD1/ADC9/TxD3
P0.0/AD0/ADC8/RxD3
P2.7/A15/PWM7
P2.6/A14/PWM6/CCP3_2
P2.5/A13/PWM5/SCLK_2/CCP2_2/I2CSCL_2
P2.4/A12/PWM4/MISO_2/CCP1_2/I2CSDA_2
P2.3/A11/PWM3/MOSI_2/CCP0_2
P2.2/A10/PWM2/SS_2/ECI_2
P2.1/A9/PWM1
P2.0/A8/PWM0/RSTSV
P4.1/ALE/CMPO_2
P3.7/INT3/RD_2/TxD_2/CMP+
P3.6/INT2/WR_2/RxD_2/CMP-
P3.5/T1/T0CLKO/ECI_4/SS_4/PWMFLT
P3.4/T0/T1CLKO/MOSI_4/CMPO
P3.3/INT1/CCP0_4/MISO_4/I2CSDA_4
P3.2/INT0/CCP1_4/SCLK_4/I2CSCL_4
P3.1/TxD/CCP2_4
P3.0/RxD/CCP3_4/INT4
Vcc
P3.0
P3.1
Gnd
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