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| 型号： | P89LPC9171FDH,129 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 8/27页 |
| 文件大小： | 0K |
| 描述： | IC 80C51 MCU FLASH 2KB 16TSSOP |
| 标准包装： | 96 |
| 系列： | LPC900 |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 18MHz |
| 连通性： | I²C，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 14 |
| 程序存储器容量： | 2KB（2K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 256 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.4 V ~ 3.6 V |
| 数据转换器： | A/D 4x8b; D/A 1x8b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
| 其它名称： | 935290262129 |
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2010 Microchip Technology Inc.
Preliminary
DS39979A-page 73
PIC18F87J72 FAMILY
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 -127 to 128) 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 the FSR0H:FSR0L regis-
ters contain 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.
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
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| VE-J1W-IW | CONVERTER MOD DC/DC 5.5V 100W |
| VE-J1V-IW | CONVERTER MOD DC/DC 5.8V 100W |
| VE-J10-IW | CONVERTER MOD DC/DC 5V 100W |
| VE-JTJ-IW | CONVERTER MOD DC/DC 36V 100W |
| VE-JT4-IW | CONVERTER MOD DC/DC 48V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| P89LPC917FDH | 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 2K FLASH TSSOP16 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 2K FLASH, TSSOP16 |
| P89LPC917FDH,129 | 功能描述:8位微控制器 -MCU 80C51 2K FL 256B RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| P89LPC917FDH129 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 18MHZ TSSOP-16 |
| P89LPC917FDH-S | 制造商:NXP Semiconductors 功能描述:MCU 8-bit P89 80C51 CISC 2KB Flash 2.5V/3.3V 16-Pin TSSOP |
| P89LPC920 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM |
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