參數(shù)資料
型號: MB91121PFV
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 50 MHz, RISC MICROCONTROLLER, PQFP120
封裝: PLASTIC, LQFP-120
文件頁數(shù): 29/100頁
文件大?。?/td> 2316K
代理商: MB91121PFV
MB91121 Series
34
DS07-16303-4E
■ PERIPHERAL RESOURCES
1.
I/O Ports
There are 2 types of I/O port register structure; port data register (PDR2, PDR6, PDR8, PDRA, PDRB, PDRE
to PDRI) and data direction register (DDR2, DDR6, DDR8, DDRA, DDRB, DDRE to DDRI) , where bits PDR2,
PDR6, PDR8, PDRA, PDRB, PDRE to PDRI and bits DDR2, DDR6, DDR8, DDRA, DDRB, DDRE to DDRI
corresponds respectively. Each bit on the register corresponds to an external pin. In port registers input/output
register of the port configures input/output function of the port, while corresponding bit (pin) configures input/
output function in data direction registers. Bit “0” specifies input and “1” specifies output.
For input (DDR
= 0) setting;
PDR reading operation : reads level of corresponding external pin.
PDR writing operation : writes set value to PDR.
For output (DDR
= 1) setting;
PDR reading operation : reads PDR value.
PDR writing operation : outputs PDR value to corresponding external pin.
Block diagram
PDR
DDR
1
0
1
0
(Port data register)
(Data direction register)
Resource output enable
Resource output
PDR read
Resource input
Pin
Data
bus
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