參數(shù)資料
型號(hào)： M37902FGCHP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 26 MHz, MICROCONTROLLER, PQFP100
封裝： 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件頁數(shù)： 64/143頁
文件大?。?/td> 1148K
代理商： M37902FGCHP
M37902FCCHP, M37902FGCHP, M37902FJCHP
27
MITSUBISHI MICROCOMPUTERS
SHINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Fig. 19 Waveform example when recovery cycle is inserted
At
instruction
prefetch
At
double
consecutive
access
At
quadruple
consecutive
access
Recovery cycle = 1 cycle of
φ1
Recovery cycle = 2 cycles of
φ1
φ1
A0 to A23
ALE
RD
Address
Address + 2
φ1
A0 to A23
ALE
RD
Address
Address + 2
Address + 4
φ1
A0 to A23
ALE
RD
Address
Address + 2
Instruction prefetch
Recovery
cycle
Next access
cycle
Instruction prefetch
Recovery cycle
Next access
cycle
When address locates at 4-byte boundary, or when branched.
Address + 6
Instruction prefetch
Recovery
cycle
Next access
cycle
φ1
A0 to A23
ALE
RD
Address
Address + 2
Address + 4
Address + 6
Instruction prefetch
Recovery cycle
Next access
cycle
When address locates at 8-byte boundary.
At
data
access
φ1
A0 to A23
ALE
RD,
Address
Access cycle
Recovery
cycle
Next access
cycle
BLW, BHW
φ1
A0 to A23
ALE
RD,
Address
Access cycle
Recovery cycle
Next access
cycle
BLW, BHW
Notes 1: The recovery cycle insert is specified by the recovery cycle insert select bit and the recovery-cycle-insert-number select bit (bits 4 and 6 at address 5F16).
Recovery cycle insertion is valid only at access to area CSi.
2: The above is applied when 1 bus cycle = 2
φ.
q Recovery cycle
A recovery cycle which is equivalent to 1 or 2 cycles of
φ1 can be in-
___
serted after each area CSi’s access cycle. Whether the recovery
cycle is inserted or not is determined by the recovery cycle insert
___
select bit of each CSi control register L (bit 6 at addresses 8016, 8216,
8416, 8616). Also, the number of the recovery cycles is selected by
the recovery-cycle-insert-number select bit of the processor mode
register 1 (bit 6 at address 5F16). Figure 19 shows a waveform ex-
ample when a recovery cycle is inserted.
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