参数资料
型号: AT90USB1286-MUR
厂商: Atmel
文件页数: 78/106页
文件大小: 0K
描述: MCU AVR 128K FLASH 16MHZ 64QFN
产品培训模块: MCU Product Line Introduction
megaAVR Introduction
标准包装: 4,000
系列: AVR® 90USB
核心处理器: AVR
芯体尺寸: 8-位
速度: 16MHz
连通性: EBI/EMI,I²C,SPI,UART/USART,USB,USB OTG
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 48
程序存储器容量: 128KB(128K x 8)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-VFQFN 裸露焊盘
包装: 带卷 (TR)
其它名称: AT90USB1286-MUR-ND
AT90USB1286-MURTR
73
7593L–AVR–09/12
AT90USB64/128
11.2.2
Toggling the pin
Writing a logic one to PINxn toggles the value of PORTxn, independent on the value of DDRxn.
Note that the SBI instruction can be used to toggle one single bit in a port.
11.2.3
Switching between input and output
When switching between tri-state ({DDxn, PORTxn} = 0b00) and output high ({DDxn, PORTxn}
= 0b11), an intermediate state with either pull-up enabled {DDxn, PORTxn} = 0b01) or output
low ({DDxn, PORTxn} = 0b10) occurs. Normally, the pull-up enabled state is fully acceptable, as
a high-impedant environment will not notice the difference between a strong high driver and a
pull-up. If this is not the case, the PUD bit in the MCUCR Register can be set to disable all pull-
ups in all ports.
Switching between input with pull-up and output low generates the same problem. The user
must use either the tri-state ({DDxn, PORTxn} = 0b00) or the output high state ({DDxn, PORTxn}
= 0b11) as an intermediate step.
Table 11-1 summarizes the control signals for the pin value.
11.2.4
Reading the pin value
Independent of the setting of Data Direction bit DDxn, the port pin can be read through the
PINxn Register bit. As shown in Figure 11-2 on page 72, the PINxn Register bit and the preced-
ing latch constitute a synchronizer. This is needed to avoid metastability if the physical pin
changes value near the edge of the internal clock, but it also introduces a delay. Figure 11-3 on
page 74 shows a timing diagram of the synchronization when reading an externally applied pin
value. The maximum and minimum propagation delays are denoted t
pd, max and tpd,min
respectively.
Table 11-1.
Port pin configurations.
DDxn
PORTxn
PUD
(in MCUCR)
I/O
Pull-up
Comment
0
X
Input
No
Tri-state (Hi-Z)
0
1
0
Input
Yes
Pxn will source current if ext. pulled low
0
1
Input
No
Tri-state (Hi-Z)
1
0
X
Output
No
Output Low (Sink)
1
X
Output
No
Output High (Source)
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