参数资料
型号: ST72T774S9T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
封装: TQFP-44
文件页数: 46/144页
文件大小: 1280K
代理商: ST72T774S9T1
ST72774/ST727754/ST72734
14/144
1.4 External connections
The following figure shows the recommended ex-
ternal connections for the device.
The VPP pin is only used for programming OTP
and EPROM devices and must be tied to ground in
user mode.
The 10 nF and 0.1 F decoupling capacitors on
the power supply lines are a suggested EMC per-
formance/cost tradeoff.
The external reset network (including the manda-
tory 1K serial resistor) is intended to protect the
device against parasitic resets, especially in noisy
environments.
Unused I/Os should be tied high to avoid any un-
necessary power consumption on floating lines.
An alternative solution is to program the unused
ports as inputs with pull-up.
Figure 4. Recommended External Connections
VPP
VDD
VSS
OSCIN
OSCOUT
RESET
VDD
0.1F
+
See
Clocks
Section
VDD
0.1F
EXTERNAL RESET CIRCUIT
Or configure unused I/O ports
Unused I/O
10nF
4.7K
10K
by software as input with pull-up
VDD
1K
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