只不过它们的状态正好相反,当读时,一个为高,一个为低
PIN92(R/W):
Read/write qualifier signal. R/W indicates transfer
direction during communication to an external
device. It is normally in read mode (high), unless
low level is asserted for performing a write
operation. R/W is placed in the high-impedance
state.
PIN19(W/R):
Write/Read qualifier or GPIO. This is an inverted
R/W signal useful for zero-wait-state memory
normally low, unless a memory write
interface. It is operation is performed. See Table 12,
Port C section, for reset note regarding LF2406A and
LF2402A. (↑)![]() |
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