参数资料
型号: ATTINY2313A-SUR
厂商: Atmel
文件页数: 93/172页
文件大小: 0K
描述: MCU AVR 2KB FLASH 20MHZ 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: 20MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 18
程序存储器容量: 2KB(1K x 16)
程序存储器类型: 闪存
EEPROM 大小: 128 x 8
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 5.5 V
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: ATTINY2313A-SUR-ND
27
8246B–AVR–09/11
ATtiny2313A/4313
6.2
Clock Sources
The device has the following clock source options, selectable by Flash Fuse bits as shown
below. The clock from the selected source is input to the AVR clock generator, and routed to the
appropriate modules.
Note:
1. For all fuses “1” means unprogrammed while “0” means programmed.
The various choices for each clocking option is given in the following sections. When the CPU
wakes up from Power-down, the selected clock source is used to time the start-up, ensuring sta-
ble Oscillator operation before instruction execution starts. When the CPU starts from reset,
there is an additional delay allowing the power to reach a stable level before commencing nor-
mal operation. The Watchdog Oscillator is used for timing this real-time part of the start-up time.
6.2.1
Default Clock Source
The device is shipped with CKSEL = “0100”, SUT = “10”, and CKDIV8 programmed. The default
clock source setting is the Internal RC Oscillator with longest start-up time and an initial system
clock prescaling of 8, resulting in 1.0 MHz system clock. This default setting ensures that all
users can make their desired clock source setting using an In-System or Parallel programmer.
For low-voltage devices it should be noted that unprogramming the CKDIV8 fuse may result in
overclocking. At low voltages (below 2.7V) the devices are rated for maximum 4 MHz operation
(see Section 22.3 on page 200), but routing the clock signal from the internal oscillator directly to
the system clock line will run the device at 8 MHz.
6.2.2
External Clock
To drive the device from an external clock source, XTAL1 should be driven as shown in Figure
6-2. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
Table 6-1.
Device Clocking Select
Device Clocking Option
CKSEL3..0(1)
External Clock (see page 27)
0000
Calibrated Internal RC Oscillator 4 MHz (see page 28)
0010
Calibrated internal RC Oscillator 8 MHz (see page 28)
0100
128 kHz Internal Oscillator (see page 29)
0110
External Crystal/Ceramic Resonator (see page 30)
1000 - 1111
Reserved
0001/0011/0101/0111
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