參數(shù)資料
型號: ST72T121J4B6
元件分類: 8位微控制器
英文描述: 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述: 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁數(shù): 7/93頁
文件大小: 915K
代理商: ST72T121J4B6
7/93
ST72E121 ST72T121
1.3 EXTERNAL CONNECTIONS
The following figure shows the recommended ex-
ternal connections for the device.
The V
PP
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 μF decoupling capacitors on
the power supply lines are a suggested EMC per-
formance/cost tradeoff.
The external reset network 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
V
PP
V
DD
V
SS
OSCIN
OSCOUT
RESET
V
DD
0.1μF
+
See
Clocks
Section
V
DD
0.1μF
0.1μF
EXTERNAL RESET CIRCUIT
Or configure unused I/O ports
by software as input with pull-up
Unused I/O
10nF
4.7K
10K
V
DD
Detector (LVD) is used
Optional if Low Voltage
7
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