參數(shù)資料
型號: M37902FJCHP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述: 單片16位CMOS微機(jī)
文件頁數(shù): 27/143頁
文件大?。?/td> 1463K
代理商: M37902FJCHP
M37902FCCHP, M37902FGCHP, M37902FJCHP
27
MITSUBISHI MICROCOMPUTERS
SHINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Fig. 19 Waveform example when recovery cycle is inserted
A
A
a
A
a
Recovery cycle = 1 cycle of
φ
1
Recovery cycle = 2 cycles of
φ
1
φ
1
A
0
to A
23
ALE
RD
Address
Address + 2
φ
1
A
0
to A
23
ALE
RD
Address
Address + 2
Address + 4
φ
1
A
0
to A
23
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
φ
1
A
0
to A
23
ALE
RD
Address
Address + 2
Address + 4
Address + 6
Instruction prefetch
Recovery cycle
Next access
cycle
When address locates at 8-byte boundary.
A
φ
1
A
0
to A
23
ALE
RD,
Address
Access cycle
Recovery
cycle
Next access
cycle
BLW, BHW
φ
1
A
0
to A
23
ALE
Address
Access cycle
Recovery cycle
Next access
cycle
BLW, RD,
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 5F
16
).
Recovery cycle insertion is valid only at access to area CS
i
.
2:
The above is applied when 1 bus cycle = 2
φ
.
G
Recovery cycle
A recovery cycle which is equivalent to 1 or 2 cycles of
φ
1
can be in-
serted after each area CS
i
s
access cycle. Whether the recovery
cycle is inserted or not is determined by the recovery cycle insert
select bit of each CS
i
control register L (bit 6 at addresses 80
16
, 82
16
,
84
16
, 86
16
). 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 5F
16
). Figure 19 shows a waveform ex-
ample when a recovery cycle is inserted.
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