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SDA 6000
PRELIMINARY DATA SHEET
Version 2.1
C16X Microcontroller
4 - 47
Micronas
DPP2
Reset Value: 0002
H
DPP3
Reset Value: 0003
H
The DPP registers are implicitly used whenever data accesses to any memory location
are made via indirect or direct long 16-bit addressing modes (except for override
accesses via EXTended instructions and PEC data transfers). After reset, the Data Page
Pointers are initialized in a way that all indirect or direct long 16-bit addresses result in
identical 18-bit addresses. This allows access to data pages 3 … 0 within segment 0 as
shown in the figure below. If the user does not want to use any data paging, no further
action is required.
Data paging is performed by concatenating the lower 14 bits of an indirect or direct long
16-bit address with the contents of the DPP register selected by the upper two bits of the
16-bit address. The contents of the selected DPP register specify one of the 1024
possible data pages. This data page base address, together with the 14-bit page offset,
forms the physical 24-bit address (selectable part is driven to the address pins).
In case of non-segmented memory mode, only the two least significant bits of the
implicitly selected DPP register are used to generate the physical address. Thus,
extreme care should be taken when changing the content of a DPP register if a non-
segmented memory model is selected, because otherwise unexpected results could
occur.
In case of the segmented memory mode the selected number of segment address bits
(via bit field SALSEL) of the respective DPP register is output on the respective segment
address pins of Port 4 for all external data accesses.
A DPP register can be updated via any instruction, which is capable of modifying an
SFR.
Bit
Function
DPPxPN
Data Page Number of DPPx
Specifies the data page selected via DPPx. Only the least significant two
bits of DPPx are significant, when segmentation is disabled.
-
-
-
5
4
3
2
1
0
11
10
9
8
7
6
15
14
13
12
-
rw
-
-
-
-
-
-
-
-
DPP2PN
-
-
-
5
4
3
2
1
0
11
10
9
8
7
6
15
14
13
12
-
rw
-
-
-
-
-
-
-
-
DPP3PN
Содержание SDA 6000
Страница 3: ...Contents Overview...
Страница 21: ...Pin Description...
Страница 22: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Pin Descriptions 2 3 Micronas 2 Pin Descriptions...
Страница 29: ...Architectural Overview...
Страница 33: ...C16X Microcontroller...
Страница 34: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 C16X Microcontroller 4 3 Micronas 4 C16X Microcontroller...
Страница 88: ...Interrupt and Trap Function...
Страница 122: ...System Control Configuration...
Страница 159: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 System Control Configuration 6 40 Micronas...
Страница 160: ...Peripherals...
Страница 282: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Peripherals 7 124 Micronas...
Страница 283: ...Clock System...
Страница 284: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Clock System 8 3 Micronas 8 Clock System...
Страница 288: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Clock System 8 8 Micronas...
Страница 289: ...Sync System...
Страница 290: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Sync System 9 3 Micronas 9 Sync System...
Страница 301: ...Display Generator...
Страница 302: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Display Generator 10 3 Micronas 10 Display Generator...
Страница 348: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Display Generator 10 50 Micronas...
Страница 349: ...D A Converter...
Страница 352: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 D A Converter 11 6 Micronas...
Страница 353: ...Slicer and Acquisition...
Страница 354: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Slicer and Acquisition 12 3 Micronas 12 Slicer and Acquisition...
Страница 381: ...Register Overview...
Страница 398: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Register Overview 13 20 Micronas...
Страница 399: ...Elelctrical Characteristics...
Страница 400: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Electrical Characteristics 14 3 Micronas 14 Electrical Characteristics...
Страница 411: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Electrical Characteristics 14 14 Micronas...