參數(shù)資料
型號(hào)： TS68230CP10
廠商： 意法半導(dǎo)體
英文描述： HMOS PARALLEL INTERFACE/TIMER
中文描述： HMO的并行接口/定時(shí)器
文件頁(yè)數(shù)： 12/61頁(yè)
文件大?。?/td> 2911K
代理商： TS68230CP10
of chip select, then three-stated to avoid interfe-
rence with the next bus cycle.
The system designer must take care that DTACK is
negated and three-stated quickly enough after each
bus cycle to avoid interference with the next one.
With an TS68000 this necessitates a relatively fast
external path from the data strobe negation to CS
bus master negation.
1.4.2. INTERRUPT ACKNOWLEDGE CYCLES.
Special internal operations take place on PI/T inter-
rupt acknowledge cycles. The port interrupt vector
register or the timer vector register are implicitly ad-
dressed by the assertion of PC6/PIACK or
PC7/TIACK, respectively. The signals are first syn-
chronized with the falling edge of the clock. One
clock period after they are recognized, the data bus
buffers are enabled and the vector is driven onto the
bus. DTACK is asserted after another clock period
to allow the vector some setup time prior to DTACK.
DTACK is negated, then three-stated, as with nor-
mal read or write cycles, when PIACK or TIACK is
negated.
1.4.3. WRITE CYCLES. In many ways, write cycles
are similar to normal read cycles. On write cycles,
data at the D0-D7 pins must meet the same setup
specifications as the register select and R/W lines.
Like these signals, write data is latched on the as-
serted edge of CS, and must meet small setup and
hold time requirements with respect to that edge.
The same bus cycle recovery conditions exist as for
normal read cycles. No other differences exist.
TS68230
12/61
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TS68230CP8 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HMOS PARALLEL INTERFACE/TIMER
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TS68230MC1B/C10 制造商:e2v technologies 功能描述:
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