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| 型號(hào)： | DV164136 |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 98/107頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | DEVELOPMENT KIT FOR PIC18 |
| 產(chǎn)品培訓(xùn)模塊： | PIC18 J Series MCU Overview |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | PIC® |
| 類型： | MCU |
| 適用于相關(guān)產(chǎn)品： | PIC18F8722，PIC18F87J11 |
| 所含物品： | 板，線纜，CD，PICkit? 3 個(gè)編程器，電源 |
| 產(chǎn)品目錄頁(yè)面： | 659 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | PIC18F87J11-I/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP PIC18F87J11T-I/PTTR-ND - IC PIC MCU FLASH 64KX16 80TQFP PIC18F8722T-E/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP PIC18F8722-E/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP PIC18F8722T-I/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP PIC18F8722-I/PT-ND - IC PIC MCU FLASH 64KX16 80TQFP |
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PIC18F87J11 FAMILY
DS39778E-page 90
2007-2012 Microchip Technology Inc.
6.4.3.2
FSR Registers and POSTINC,
POSTDEC, PREINC and PLUSW
In addition to the INDF operand, each FSR register pair
also has four additional indirect operands. Like INDF,
these are “virtual” registers that cannot be indirectly
read or written to. Accessing these registers actually
accesses the associated FSR register pair, but also
performs a specific action on its stored value. They are:
POSTDEC: accesses the FSR value, then
automatically decrements it by ‘1’ afterwards
POSTINC: accesses the FSR value, then
automatically increments it by ‘1’ afterwards
PREINC: increments the FSR value by ‘1’, then
uses it in the operation
PLUSW: adds the signed value of the W register
(range of -128 to 127) to that of the FSR and uses
the new value in the operation
In this context, accessing an INDF register uses the
value in the FSR registers without changing them.
Similarly, accessing a PLUSW register gives the FSR
value offset by the value in the W register; neither value
is actually changed in the operation. Accessing the
other virtual registers changes the value of the FSR
registers.
Operations on the FSRs with POSTDEC, POSTINC
and PREINC affect the entire register pair; that is, roll-
overs of the FSRnL register from FFh to 00h carry over
to the FSRnH register. On the other hand, results of
these operations do not change the value of any flags
in the STATUS register (e.g., Z, N, OV, etc.).
The PLUSW register can be used to implement a form
of Indexed Addressing in the data memory space. By
manipulating the value in the W register, users can
reach addresses that are fixed offsets from pointer
addresses. In some applications, this can be used to
implement some powerful program control structure,
such as software stacks, inside of data memory.
6.4.3.3
Operations by FSRs on FSRs
Indirect Addressing operations that target other FSRs
or virtual registers represent special cases. For
example, using an FSR to point to one of the virtual
registers will not result in successful operations. As a
specific case, assume that FSR0H:FSR0L contains
FE7h, the address of INDF1. Attempts to read the
value of the INDF1, using INDF0 as an operand, will
return 00h. Attempts to write to INDF1, using INDF0 as
the operand, will result in a NOP.
On the other hand, using the virtual registers to write to
an FSR pair may not occur as planned. In these cases,
the value will be written to the FSR pair but without any
incrementing or decrementing. Thus, writing to INDF2
or POSTDEC2 will write the same value to the
FSR2H:FSR2L.
Since the FSRs are physical registers mapped in the
SFR space, they can be manipulated through all direct
operations. Users should proceed cautiously when
working on these registers, particularly if their code
uses Indirect Addressing.
Similarly, operations by Indirect Addressing are gener-
ally permitted on all other SFRs. Users should exercise
the appropriate caution that they do not inadvertently
change settings that might affect the operation of the
device.
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