參數資料
型號： ST7FLU05MAE
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SOP-8
文件頁數： 78/124頁
文件大?。?/td> 2186K
代理商： ST7FLU05MAE
Obsolete
Product(s)
- Obsolete
Product(s)
ST7LUS5, ST7LU05, ST7LU09
I/O ports
57/124
9
I/O ports
9.1
Introduction
The I/O port offers different functional modes:
●
transfer of data through digital inputs and outputs
and for specific pins:
●
external interrupt generation
●
alternate signal input/output for the on-chip peripherals.
An I/O port contains up to six pins. Each pin (except PA3/RESET) can be programmed
independently as digital input (with or without interrupt generation) or digital output.
9.2
Functional description
Each port has two main registers:
●
Data register (DR)
●
Data direction register (DDR)
and one optional register:
●
Option register (OR)
Each I/O pin may be programmed using the corresponding register bits in the DDR and OR
registers, with bit X corresponding to pin X of the port. The same correspondence is used for
the DR register.
The following description takes into account the OR register (for specific ports which do not
provide this register refer to Section 9.6: I/O port implementation). The generic I/O block
diagram is shown in Figure 35.
9.2.1
Input modes
The input configuration is selected by clearing the corresponding DDR register bit.
In this case, reading the DR register returns the digital value applied to the external I/O pin.
Different input modes can be selected by software through the OR register.
Note:
1
Writing the DR register modifies the latch value but does not affect the pin status.
2
PA3 cannot be configured as input.
External interrupt function
When an I/O is configured as Input with Interrupt, an event on this I/O can generate an
external interrupt request to the CPU.
Each pin can independently generate an interrupt request. The interrupt sensitivity is
independently programmable using the sensitivity bits in the EICR register.
External interrupts are hardware interrupts. Fetching the corresponding interrupt vector
automatically clears the request latch. Changing the sensitivity of a particular external
interrupt clears this pending interrupt. This can be used to clear unwanted pending
interrupts.
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ST7FMC1K2T6 功能描述:8位微控制器 -MCU 8K Flash 384 RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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