參數資料
型號: M37902FCCHP
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
文件頁數: 29/143頁
文件大?。?/td> 1463K
代理商: M37902FCCHP
M37902FCCHP, M37902FGCHP, M37902FJCHP
29
MITSUBISHI MICROCOMPUTERS
SHINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
G
Address output selection
As shown in Figure 21, the unnecessary state change of address
output pins (A
0
to A
23
) can be avoided, without outputting an address
at access to the internal area.
When the address output select bit of the particular function select
register 1 (bit 4 at address 63
16
) is set to
1
, an address is output
only at access to the external area. Also, at access to the internal
area, the address at the preceding access to the external area is re-
tained. The address output start timing in this case is the half cycle
of
φ
1
later than that at the normal access (when the address output
select bit =
0
). For the bit structure of the particular function select
register 1, refer to the section on the standby function.
Also, at the normal access, an address is output at both of the ac-
cess to the internal and external areas.
Fig. 21 Waveform example depending on address output function selection
Access to
external area
φ
1
RD,
BLW,BHW
A
0
to A
23
RD,
BLW,BHW
A
0
to A
23
Access to
external area
Address output select bit = 0
Address output select bit = 1
(Address waveform changes only
when external access is generated.)
Access to
internal area
Address
Address
Address
Address
Unde-
fined
Unde-
fined
相關PDF資料
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