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参数资料
| 型号： | P87C554 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | 80C51 8-bit microcontroller(80C51 8位微控制器) |
| 中文描述： | 80C51的8位微控制器（80C51的8位微控制器） |
| 文件页数： | 12/78页 |
| 文件大小： | 393K |
| 代理商： | P87C554 |
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Philips Semiconductors
Preliminary specification
80C554/83C554/87C554
80C51 8-bit microcontroller
16K/512 OTP/ROM/ROMless, 8 channel 10 bit A/D, I
2
C, PWM,
capture/compare, high I/O
1999 Apr 07
12
ERAM
256 BYTES
UPPER
128 BYTES
INTERNAL RAM
LOWER
128 BYTES
INTERNAL RAM
SPECIAL
FUNCTION
REGISTER
FF
00
FF
00
FF
00
80
80
EXTERNAL
DATA
MEMORY
FFFF
0000
0100
SU00980
Figure 5. Internal and External Data Memory Address Space with EXTRAM = 0
Dual DPTR
The dual DPTR structure (see Figure 6) is a way by which the chip
will specify the address of an external data memory location. There
are two 16-bit DPTR registers that address the external memory,
and a single bit called DPS = AUXR1/bit0 that allows the program
code to switch between them.
The DPS bit status should be saved by software when switching
between DPTR0 and DPTR1.
DPS
DPTR1
DPTR0
DPH
(83H)
DPL
(82H)
EXTERNAL
DATA
MEMORY
SU00745A
BIT0
AUXR1
Figure 6.
Note that bit 2 is not writable and is always read as a zero. This
allows the DPS bit to be quickly toggled simply by executing an
INC AUXR1 instruction without affecting the other bits.
DPTR Instructions
The instructions that refer to DPTR refer to the data pointer that is
currently selected using the AUXR1/bit 0 register. The six
instructions that use the DPTR are as follows:
INC DPTR
Increments the data pointer by 1
MOV DPTR, #data16
Loads the DPTR with a 16-bit constant
MOV A, @ A+DPTR
Move code byte relative to DPTR to ACC
MOVX A, @ DPTR
Move external RAM (16-bit address) to
ACC
MOVX @ DPTR , A
Move ACC to external RAM (16-bit
address)
JMP @ A + DPTR
Jump indirect relative to DPTR
The data pointer can be accessed on a byte-by-byte basis by
specifying the low or high byte in an instruction which accesses the
SFRs. See application note AN458 for more details.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| P87C554SBAA | 制造商:NXP Semiconductors 功能描述:MCU 8-Bit 87C 80C51 CISC 16KB EPROM 5V 68-Pin PLCC |
| P87C554SBAA,512 | 功能描述:8位微控制器 -MCU 80C51 16K/512 OTP 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 |
| P87C554SBBD | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:80C51 8-bit microcontroller . 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP |
| P87C554SFAA | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:80C51 8-bit microcontroller ? 12 clock operation 16K/512 OTP/RAM 8 channel 10-bit A/D, I2C, PWM, capture/compare, high I/O |
| P87C554SFAA,512 | 功能描述:8位微控制器 -MCU 80C51 16K/512 OTP 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 |
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