参数资料
型号: AT89LP4052-16XU
厂商: Atmel
文件页数: 16/94页
文件大小: 0K
描述: IC 8051 MCU FLASH 4K 20TSSOP
标准包装: 74
系列: 89LP
核心处理器: 8051
芯体尺寸: 8-位
速度: 16MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 15
程序存储器容量: 4KB(4K 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 ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
包装: 管件
23
3547J–MICRO–10/09
AT89LP2052/LP4052
15.6
Port Read-Modify-Write
A read from a port will read either the state of the pins or the state of the port register depending
on which instruction is used. Simple read instructions will always access the port pins directly.
Read-modify-write instructions, which read a value, possibly modify it, and then write it back, will
always access the port register. This includes bit write instructions such as CLR or SETB as they
actually read the entire port, modify a single bit, then write the data back to the entire port. See
Table 15-2 for a complete list of Read-Modify-Write instruction which may access the ports.
15.7
Port Alternate Functions
Most general-purpose digital I/O pins of the AT89LP2052/LP4052 share functionality with the
various I/Os needed for the peripheral units. Table 15-4 lists the alternate functions of the port
pins. Alternate functions are connected to the pins in a logic AND fashion. In order to enable the
alternate function on a port pin, that pin must have a “1” in its corresponding port register bit, oth-
erwise, the input/output will always be “0”. Furthermore, each pin must be configured
for the correct input/output mode as required by its peripheral before it may be used as such.
Table 15-3 shows how to configure a generic pin for use with an alternate function.
Table 15-2.
Port Read-Modify-Write Instructions
Mnemonic
Instruction
Example
ANL
Logical AND
ANL P1, A
ORL
Logical OR
ORL P1, A
XRL
Logical EX-OR
XRL P1, A
JBC
Jump if bit set and clear bit
JBC P3.0, LABEL
CPL
Complement bit
CPL P3.1
INC
Increment
INC P1
DEC
Decrement
DEC P3
DJNZ
Decrement and jump if not zero
DJNZ P3, LABEL
MOV PX.Y, C
Move carry to bit Y of Port X
MOV P1.0, C
CLR PX.Y
Clear bit Y of Port X
CLR P1.1
SETB PX.Y
Set bit Y of Port X
SETB P3.2
Table 15-3.
Alternate Function Configurations for Pin y of Port x
PxM0.y
PxM1.y
Px.y
I/O Mode
0
1
Bidirectional (internal pull-up)
011
Output
1
0
X
Input
1
Bidirectional (external pull-up)
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AT89LP4052-20SU 功能描述:8位微控制器 -MCU SINGLE CYCLE 4K FLASH-20MHZ 2.4-5.5V 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
AT89LP4052-20XU 功能描述:8位微控制器 -MCU SINGLE CYC 4K FLASH -20MHZ 2.4-5.5V 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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