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7721 bảng dữ liệu(PDF) 55 Page - Renesas Technology Corp

tên linh kiện 7721
Giải thích chi tiết về linh kiện  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 bảng dữ liệu(HTML) 55 Page - Renesas Technology Corp

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CONNECTION WITH EXTERNAL DEVICES
3.2 Software Wait
7721 Group User's Manual
3–8
3.2 Software Wait
Software Wait provides a function to facilitate access to external devices that require long access time. To
select the software Wait, use the wait bit (bit 2 at address 5E16). Figure 3.2.1 shows the structure of
processor mode register 0 (address 5E16). Figure 3.2.2 shows examples of bus timing when software Wait
is used.
Software Wait is valid only for the eternal area. The internal area is always accessed with no Wait.
Fig. 3.2.1 Structure of processor mode register 0
Bit
Bit name
Functions
At reset
RW
0
1
3
4
5
6
7
Fix this bit to “0.”
Software reset bit
Interrupt priority detection time
select bits
Stack bank select bit
0
0
0
The microcomputer is reset by
writing “1” to this bit. The value is
“0” at reading.
0 0 : 7 cycles of
0 1 : 4 cycles of
1 0 : 2 cycles of
1 1 : Do not select.
0 : Bank 016
1 : Bank FF16
0
1
b5 b4
Processor mode register 0 (Address 5E16)
b1
b0
b2
b3
b4
b5
b6
b7
0
RW
–
WO
0
RW
0
RW
Fix this bit to “0.”
RW
RW
0
Nothing is assigned.
The value is “1” at reading.
2
0
Wait bit
RW
0 : Software Wait is inserted when
accessing external area.
1 : No software Wait is inserted
when accessing external area.
: Bits 0, 1, and 3 to 6 are not used for accessing external area.



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