參數(shù)資料
型號: Z84C9008VSC
文件頁數(shù): 10/31頁
文件大?。?/td> 491K
代理商: Z84C9008VSC
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A0–A3.
Address bus (inputs). Used to select the port/register for each bus cycle.
ARDY, BRDY.
Port Ready (outputs, Active High). These signals indicate that the port is
ready for a data transfer. In Mode 0, the signal indicates that the port has data available to
the peripheral device. In Mode 1, the signal indicates that the port is ready to accept data
from the peripheral device. In Mode 2, ARDY indicates that Port A has data available for
the peripheral device, but that the data is not be placed onto PA0
PA7 until the ASTB sig-
nal is Active. BRDY indicates that Port A is able to accept data from a peripheral device.
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