參數(shù)資料
型號: MB90P634APF
元件分類: 微控制器/微處理器
英文描述: 16-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 30/107頁
文件大?。?/td> 1599K
代理商: MB90P634APF
29
MB90630A Series
s PERIPHERAL RESOURCES
1. Parallel Ports
(1) I/O Ports
Each port pin can be specified as either an input or output by its corresponding direction register when the pin
is not set for use by a peripheral. When a port is set as an input, reading the data register always reads the
value corresponding to the pin level. When a port is set as an output, reading the data register reads the data
register latch value. The same applies when reading using a read-modify-write instruction.
When used as control outputs, reading the data register reads the control output value, irrespective of the
direction register value.
Note that if a read-modify-write instruction (set bit or similar instruction) is used to set output data in the data
register before switching a pin from input to output, the instruction reads the input level at the pin and not the
data register latch value.
Data register
Direction register
Data register read
Data register write
Direction register write
Direction register read
Pin
Internal
data
bus
Block Diagram
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