参数资料
型号: ATMEGA1284-AUR
厂商: Atmel
文件页数: 97/160页
文件大小: 0K
描述: IC MCU AVR 128K FLASH 44TQFP
产品培训模块: megaAVR Introduction
标准包装: 1
系列: AVR® ATmega
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: 32
程序存储器容量: 128KB(64K x 16)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 16K x 8
电压 - 电源 (Vcc/Vdd): 1.8 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: 44-TQFP
包装: 剪切带 (CT)
41
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
The CKDIV8 Fuse determines the initial value of the CLKPS bits. If CKDIV8 is unprogrammed,
the CLKPS bits will be reset to “0000”. If CKDIV8 is programmed, CLKPS bits are reset to
“0011”, giving a division factor of 8 at start up. This feature should be used if the selected clock
source has a higher frequency than the maximum frequency of the device at the present operat-
ing conditions. Note that any value can be written to the CLKPS bits regardless of the CKDIV8
Fuse setting. The Application software must ensure that a sufficient division factor is chosen if
the selected clock source has a higher frequency than the maximum frequency of the device at
the present operating conditions. The device is shipped with the CKDIV8 Fuse programmed.
Table 9-16.
Clock prescaler select.
CLKPS3
CLKPS2
CLKPS1
CLKPS0
Clock division factor
00
1
00
01
2
00
10
4
00
11
8
01
00
16
01
32
01
10
64
01
11
128
10
00
256
10
01
Reserved
10
Reserved
10
11
Reserved
11
00
Reserved
11
01
Reserved
11
10
Reserved
11
Reserved
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