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| 型号： | M306V8FJFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP116 |
| 封装： | 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116 |
| 文件页数： | 32/77页 |
| 文件大小： | 2650K |
| 代理商： | M306V8FJFP |
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M306V8FJFP
Rev.1.31
Apr 18, 2005
page 36 of 363
REJ03B0082-0131
________
Figure 4.7. Example in which Wait State was Inserted into Read Cycle by RDY Signal
BCLK
RD
CSi
(i=0 to 3)
RDY
tsu(RDY - BCLK)
BCLK
RD
CSi
(i=0 to 3)
RDY
tsu(RDY - BCLK)
In an instance of separate bus
In an instance of multiplexed bus
Accept timing of RDY signal
: Wait using RDY signal
: Wait using software
Accept timing of RDY signal
Shown above is the case where CSEiW to CSEi1W (i = 0 to 3) bits in the CSE register are “002” (one wait state).
tsu(RDY-BCLK) : RDY input setup time
________
(6) The RDY Signal
This signal is provided for accessing external devices which need to be accessed at low speed. If input on
________
the RDY pin is asserted low at the last falling edge of BCLK of the bus cycle, one wait state is inserted in
________
the bus cycle. While in a wait state, the following signals retain the state in which they were when the RDY
signal was acknowledged.
______
______ ________
________
______
________
__________
A0 to A19, D0 to D15, CS0 to CS3, RD, WRL, WRH, WR, BHE, ALE, HLDA
________
Then, when the input on the RDY pin is detected high at the falling edge of BCLK, the remaining bus cycle
is executed. Figure 4.7 shows example in which the wait state was inserted into the read cycle by the
________
RDY signal. To use the RDY signal, set the corresponding bit (CS3W to CS0W bits) in the CSR register
________
to “0” (with wait state). When not using the RDY signal, process the RDY pin as an unused pin.
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