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參數(shù)資料
| 型號(hào)： | PIC18LF96J65-I/PT |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 3/131頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC PIC MCU FLASH 48KX16 100TQFP |
| 標(biāo)準(zhǔn)包裝： | 90 |
| 系列： | PIC® 18F |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 41.667MHz |
| 連通性： | EBI/EMI，以太網(wǎng)，I²C，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 70 |
| 程序存儲(chǔ)器容量： | 96KB（48K x 16） |
| 程序存儲(chǔ)器類型： | 閃存 |
| RAM 容量： | 3808 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 3.6 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 16x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 100-TQFP |
| 包裝： | 托盤 |
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PIC18F97J60 FAMILY
DS39762F-page 100
2011 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 operation. As a specific case,
assume that the FSR0H:FSR0L pair 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 pair.
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.
6.5
Program Memory and the
Extended Instruction Set
The operation of program memory is unaffected by the
use of the extended instruction set.
Enabling the extended instruction set adds five
additional two-word commands to the existing PIC18
instruction set: ADDFSR, CALLW, MOVSF, MOVSS and
SUBFSR
. These instructions are executed as described
6.6
Data Memory and the Extended
Instruction Set
Enabling the PIC18 extended instruction set (XINST
Configuration bit = 1) significantly changes certain
aspects of data memory and its addressing. Specifically,
the use of the Access Bank for many of the core PIC18
instructions is different. This is due to the introduction of
a new addressing mode for the data memory space.
This mode also alters the behavior of Indirect
Addressing using FSR2 and its associated operands.
What does not change is just as important. The size of
the data memory space is unchanged, as well as its
linear addressing. The SFR map remains the same.
Core PIC18 instructions can still operate in both Direct
and Indirect Addressing mode; inherent and literal
instructions do not change at all. Indirect Addressing
with FSR0 and FSR1 also remains unchanged.
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