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7721 датащи(PDF) 45 Page - Renesas Technology Corp

номер детали 7721
подробное описание детали  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 датащи(HTML) 45 Page - Renesas Technology Corp

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7721 Group User’s Manual
CENTRAL PROCESSING UNIT (CPU)
2–22
2.4 Memory assignment
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.
b7
b6
b5
b4
b3
b2
b1
b0
Processor mode register 1 (Address 5F16)
Bit
7 to 2
1
0
Bit name
At reset
RW
Functions
Notes 1: For the M37721S1BFP, fix bit 1 to “0.”
2: For the M37721S2BFP, set bit 1 before setting the stack pointer.
Nothing is assigned.
–
Undefined
Internal RAM area select bit
(Notes 1, 2)
0 : 512 bytes (addresses 8016 to 27F16)
1 : 1024 bytes (addresses 8016 to 47F16)
Nothing is assigned.
RW
0
–
Undefined
: Bits 0 to 6 are not used for the memory assignment.
Fig. 2.4.4 Structure of processor mode registers 0, 1



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