參數(shù)資料
型號： MP80C51C-36D
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 36 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 68/143頁
文件大小： 4602K
代理商： MP80C51C-36D
30
XMEGA A3BU [DATASHEET]
8362F–AVR–02/2013
16.
I/O Ports
16.1
Features
47 general purpose input and output pins with individual configuration
Output driver with configurable driver and pull settings:
Totem-pole
Wired-AND
Wired-OR
Bus-keeper
Inverted I/O
Input with synchronous and/or asynchronous sensing with interrupts and events
Sense both edges
Sense rising edges
Sense falling edges
Sense low level
Optional pull-up and pull-down resistor on input and Wired-OR/AND configurations
Optional slew rate control
Asynchronous pin change sensing that can wake the device from all sleep modes
Two port interrupts with pin masking per I/O port
Efficient and safe access to port pins
Hardware read-modify-write through dedicated toggle/clear/set registers
Configuration of multiple pins in a single operation
Mapping of port registers into bit-accessible I/O memory space
Peripheral clocks output on port pin
Real-time counter clock output to port pin
Event channels can be output on port pin
Remapping of digital peripheral pin functions
Selectable USART, SPI, and timer/counter input/output pin locations
16.2
Overview
One port consists of up to eight port pins: pin 0 to 7. Each port pin can be configured as input or output with configurable
driver and pull settings. They also implement synchronous and asynchronous input sensing with interrupts and events for
selectable pin change conditions. Asynchronous pin-change sensing means that a pin change can wake the device from
all sleep modes, included the modes where no clocks are running.
All functions are individual and configurable per pin, but several pins can be configured in a single operation. The pins
have hardware read-modify-write (RMW) functionality for safe and correct change of drive value and/or pull resistor
configuration. The direction of one port pin can be changed without unintentionally changing the direction of any other
pin.
The port pin configuration also controls input and output selection of other device functions. It is possible to have both the
peripheral clock and the real-time clock output to a port pin, and available for external use. The same applies to events
from the event system that can be used to synchronize and control external functions. Other digital peripherals, such as
USART, SPI, and timer/counters, can be remapped to selectable pin locations in order to optimize pin-out versus
application needs.
The notation of the ports are PORTA, PORTB, PORTC, PORTD, PORTE, PORTF and PORTR.
16.3
Output Driver
All port pins (Pn) have programmable output configuration. The port pins also have configurable slew rate limitation to
reduce electromagnetic emission.
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