參數(shù)資料
型號: M30624FGAFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件頁數(shù): 28/40頁
文件大?。?/td> 3893K
代理商: M30624FGAFP
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Bus Control
31
_____
________
Figure 1.9.4. Example of RD signal extended 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
________
Note: The RDY signal cannot be received immediately prior to a software wait.
Table 1.9.5. Microcomputer status in wait state (Note)
Item
Status
Oscillation
On
___
_____
R/W signal, address bus, data bus, CS
________
Maintain status when RDY signal received
__________
ALE signal, HLDA, programmable I/O ports
Internal peripheral circuits
On
________
(5) The RDY signal
________
RDY is a signal that facilitates access to an external device that requires long access time. As shown in
________
Figure 1.9.4, if an “L” is being input to the RDY at the BCLK falling edge, the bus turns to the wait state. If
________
an “H” is being input to the RDY pin at the BCLK falling edge, the bus cancels the wait state. Table 1.9.5
shows the state of the microcomputer with the bus in the wait state, and Figure 1.9.4 shows an example
____
________
in which the RD signal is prolonged by the RDY signal.
________
The RDY signal is valid when accessing the external area during the bus cycle in which bits 4 to 7 of the
________
chip select control register (address 000816) are set to “0”. The RDY signal is invalid when setting “1” to
________
all bits 4 to 7 of the chip select control register (address 000816), but the RDY pin should be treated as
properly as in non-using.
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