参数资料
型号: ATTINY43U-SUR
厂商: Atmel
文件页数: 6/158页
文件大小: 0K
描述: MCU AVR 4KB FLASH 8MHZ 20SOIC
产品培训模块: tinyAVR Introduction
标准包装: 1,000
系列: AVR® ATtiny
核心处理器: AVR
芯体尺寸: 8-位
速度: 8MHz
连通性: USI
外围设备: 欠压检测/复位,POR,PWM,温度传感器,WDT
输入/输出数: 16
程序存储器容量: 4KB(2K x 16)
程序存储器类型: 闪存
EEPROM 大小: 64 x 8
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 5.5 V
数据转换器: A/D 4x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 20-SOIC(0.295",7.50mm 宽)
包装: 带卷 (TR)
其它名称: ATTINY43U-SUR-ND
103
8048C–AVR–02/12
ATtiny43U
output to the opposite clock edge of the data input sampling. The serial input is always sampled
from the Data Input (DI) pin independent of the configuration.
The 4-bit counter can be both read and written via the data bus, and it can generate an overflow
interrupt. Both the USI Data Register and the counter are clocked simultaneously by the same
clock source. This allows the counter to count the number of bits received or transmitted and
generate an interrupt when the transfer is complete. Note that when an external clock source is
selected the counter counts both clock edges. This means the counter registers the number of
clock edges and not the number of data bits. The clock can be selected from three different
sources: The USCK pin, Timer/Counter0 Compare Match or from software.
The two-wire clock control unit can be configured to generate an interrupt when a start condition
has been detected on the two-wire bus. It can also be set to generate wait states by holding the
clock pin low after a start condition is detected, or after the counter overflows.
14.3
Functional Descriptions
14.3.1
Three-wire Mode
The USI Three-wire mode is compliant to the Serial Peripheral Interface (SPI) mode 0 and 1, but
does not have the slave select (SS) pin functionality. However, this feature can be implemented
in software if necessary. Pin names used by this mode are: DI, DO, and USCK.
Figure 14-2. Three-wire Mode Operation, Simplified Diagram
Figure 14-2 shows two USI units operating in three-wire mode, one as Master and one as Slave.
The two USI Data Registers are interconnected in such way that after eight USCK clocks, the
data in each register has been interchanged. The same clock also increments the USI’s 4-bit
counter. The Counter Overflow (interrupt) Flag, or USIOIF, can therefore be used to determine
when a transfer is completed. The clock is generated by the Master device software by toggling
the USCK pin via the PORTA register or by writing a one to bit USITC bit in USICR.
SLAVE
MASTER
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
DO
DI
USCK
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
DO
DI
USCK
PORTxn
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