参数资料
型号: AT89LP213-20XU
厂商: Atmel
文件页数: 20/98页
文件大小: 0K
描述: MCU 8051 2K FLASH 20MHZ 14-TSSOP
产品培训模块: MCU Product Line Introduction
标准包装: 95
系列: 89LP
核心处理器: 8051
芯体尺寸: 8-位
速度: 20MHz
连通性: SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 12
程序存储器容量: 2KB(2K x 8)
程序存储器类型: 闪存
RAM 容量: 128 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: 14-TSSOP(0.173",4.40mm 宽)
包装: 管件
27
3538E–MICRO–11/10
AT89LP213/214
13.3
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 13-3 for a complete list of Read-modify-write instruction which may access the ports.
13.4
Ports During Powerdown
Due to the 5V tolerant port structure, the output ports may have reduced V
OH while the device is
under DC conditions, i.e. in the powerdown state, and at high temperature. It is recommended
that output ports be placed in a low state, if possible, prior to entering powerdown, or else exter-
nal pullups can be used to maintain the output at a higher voltage.
13.5
Port Alternate Functions
Most general-purpose digital I/O pins of the AT89LP213/214 share functionality with the various
I/Os needed for the peripheral units. Table 13-5 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,
otherwise 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 13-4 shows how to configure a generic pin for use with an alternate function.
Table 13-3.
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 13-4.
Alternate Function Configurations for Pin y of Port x
PxM0.y
PxM1.y
Px.y
I/O Mode
0
1
bidirectional (internal pull-up)
0
1
output
1
0
X
input
1
bidirectional (external pull-up)
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