参数资料
型号: ATMEGA103-6AI
厂商: Atmel
文件页数: 84/141页
文件大小: 0K
描述: IC MCU 128K 6MHZ A/D IT 64TQFP
产品培训模块: megaAVR Introduction
标准包装: 90
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 6MHz
连通性: SPI,UART/USART
外围设备: 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: 4K x 8
电压 - 电源 (Vcc/Vdd): 4 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-TQFP
包装: 托盘
配用: ATSTK501-ND - ADAPTER KIT FOR 64PIN AVR MCU
47
ATmega103(L)
0945I–AVR–02/07
save mode was entered. After an edge on the asynchronous clock, TCNT0 will read
correctly. (The compare and overflow functions of the Timer are not affected by this
behavior.) Safe procedure to ensure correct value is read:
1.
Write any value to either of the registers OCR0 or TCCR0
2.
Wait for the corresponding Update Busy Flag to be cleared
3.
Read TCNT0
Note that OCR0 and TCCR0 are never modified by hardware, and will always read
correctly.
16-bit Timer/Counter1
Figure 33 shows the block diagram for Timer/Counter1.
The 16-bit Timer/Counter1 can select clock source from CK, prescaled CK or an exter-
nal pin. In addition, it can be stopped as described in the specification for the
Timer/Counter1 Control Register (TCCR1B). The different Status Flags (Overflow, Com-
pare Match and Capture Event) are found in the Timer/Counter Interrupt Flag Register
(TIFR). Control signals are found in the Timer/Counter1 Control Registers – TCCR1A
and TCCR1B. The interrupt enable/disable settings for Timer/Counter1 are found in the
Timer/Counter Interrupt Mask Register (TIMSK).
When Timer/Counter1 is externally clocked, the external signal is synchronized with the
Oscillator frequency of the CPU. To assure proper sampling of the external clock, the
minimum time between two external clock transitions must be at least one internal CPU
clock period. The external clock signal is sampled on the rising edge of the internal CPU
clock.
The 16-bit Timer/Counter1 features both a high-resolution and a high-accuracy usage
with the lower prescaling opportunities. Similarly, the high prescaling opportunities
makes the Timer/Counter1 useful for lower speed functions or exact timing functions
with infrequent actions.
The Timer/Counter1 supports two Output Compare functions using the Output Compare
Registers 1A and 1B (OCR1A and OCR1B) as the data sources to be compared to the
Timer/Counter1 contents. The Output Compare functions include optional clearing of
the counter on Compare A Match, and actions on the Output Compare pins on both
compare matches.
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