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7906 bảng dữ liệu(PDF) 46 Page - Renesas Technology Corp

tên linh kiện 7906
Giải thích chi tiết về linh kiện  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  531 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7906 bảng dữ liệu(HTML) 46 Page - Renesas Technology Corp

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RESET
7906 Group User’s Manual Rev.2.0
3-3
Bit name
Bit
Processor mode register 0 (Address 5E16)
Function
At reset
R/W
Processor mode bits
Interrupt priority detection time
select bits
Software reset bit
Fix this bit to “0.”
b7 b6 b5 b4 b3 b2 b1 b0
0 0 : Single-chip mode
0 1 : Do not select.
1 0 : Do not select.
1 1 : Do not select.
b1 b0
0 0 : 7 cycles of fsys
0 1 : 4 cycles of fsys
1 0 : 2 cycles of fsys
1 1 : Do not select.
b5 b4
The microcomputer is reset by writing “1” to this
bit. The value is “0” at reading.
0
1
2
3
4
5
6
7
0
0
0
1
0
0
0
0
RW
RW
RW
RW
RW
RW
WO
RW
Fig. 3.1.2 Structure of processor mode register 0
3.1.2 Software reset
The microcomputer initializes pins, CPU, and SFR area just as in the case of hardware reset (Refer to
sections “3.2 Pin state” and “3.3 State of internal area”) by writing “1” to the software reset bit. (See
Figure 3.1.2.)
After initialization is completed, the microcomputer performs “Internal processing sequence after reset.”
(Refer to section “3.4 Internal processing sequence after reset.”) After that, it executes a program
beginning with the address which has been set into the reset vector addresses (addresses FFFE16 and
FFFF16).
3.1 Reset operation
00
0
X
X
X: It may be either “0” or “1”.
Any of these bits may be either “0” or “1.”



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