參數(shù)資料
型號: ST62E28CF1
英文描述: 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTR A/D CONVERTER. 8-BIT AUTO-RELOAD TIMER. UART. OSG. SAFE RESET AND 28 PINS
中文描述: 8位微控制器(MCU)的與檢察官辦公室。光盤。 FASTR的A / D轉(zhuǎn)換器。 8位自動重加載定時器。 UART的。業(yè)務(wù)支助。安全復(fù)位和28個引腳
文件頁數(shù): 35/84頁
文件大?。?/td> 969K
代理商: ST62E28CF1
35/84
ST62T28C/E28C
I/O PORTS
(Cont’d)
4.1.1 Operating Modes
Each pin may be individually programmed as input
or output with various configurations.
This is achieved by writing the relevant bit in the
Data (DR), Data Direction (DDR) and Option reg-
isters (OR).
Table 12
illustrates the various port
configurations which can be selected by user soft-
ware.
4.1.1.1 Input Options
Pull-up, High Impedance Option. All input lines
can be individually programmed with or without an
internal pull-up by programming the OR and DR
registers accordingly. If the pull-up option is not
selected, the input pin will be in the high-imped-
ance state.
4.1.1.2 Interrupt Options
All input lines can be individually connected by
software to the interrupt system by programming
the OR and DR registers accordingly. The inter-
rupt trigger modes (falling edge, rising edge and
low level) can be configured by software as de-
scribed in the Interrupt Chapter for each port.
4.1.1.3 Analog Input Options
Some pins can be configured as analog inputs by
programming the OR and DR registers according-
ly. These analog inputs are connected to the on-
chip 8-bit Analog to Digital Converter.
ONLY ONE
pin should be programmed as an analog input at
any time, since by selecting more than one input
simultaneously their pins will be effectively short-
ed.
Table 12. I/O Port Option Selection
Note:
X = Don’t care
DDR
0
0
0
0
1
1
OR
0
0
1
1
0
1
DR
0
1
0
1
X
X
Mode
Input
Input
Input
Input
Output
Output
Option
With pull-up, no interrupt
No pull-up, no interrupt
With pull-up and with interrupt
Analog input (when available)
Open-drain output (20mA sink when available)
Push-pull output (20mA sink when available)
35
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ST62P28CB1 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTR A/D CONVERTER. 8-BIT AUTO-RELOAD TIMER. UART. OSG. SAFE RESET AND 28 PINS
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