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参数资料
型号： ATMEGA164A-PU
厂商： Atmel
文件页数： 16/160页
文件大小： 0K
描述： IC MCU AVR 16K 20MHZ 40PDIP
产品培训模块： MCU Product Line Introduction
megaAVR Introduction
标准包装： 14
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： 16KB（8K x 16）
程序存储器类型： 闪存
EEPROM 大小： 512 x 8
RAM 容量： 1K 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： 40-DIP（0.600"，15.24mm）
包装： 管件
配用： ATSTK600-RC05-ND - STK600 ROUTING CARD AVR
112
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
Figure 16-1. 16-bit Timer/Counter block diagram
(Note:).
Note:
Refer to Figure 1-1 on page 2 and ”Alternate Port Functions” on page 77 for Timer/Counter1 pin
placement and description.
16.2.1
Registers
The Timer/Counter (TCNTn), Output Compare Registers (OCRnA/B/C), and Input Capture Reg-
ister (ICRn) are all 16-bit registers. Special procedures must be followed when accessing the 16-
bit registers. These procedures are described in the section ”Accessing 16-bit Registers” on
page 113. The Timer/Counter Control Registers (TCCRnA/B/C) are 8-bit registers and have no
CPU access restrictions. Interrupt requests (abbreviated to Int.Req. in the figure) signals are all
visible in the Timer Interrupt Flag Register (TIFRn). All interrupts are individually masked with
the Timer Interrupt Mask Register (TIMSKn). TIFRn and TIMSKn are not shown in the figure.
The Timer/Counter can be clocked internally, via the prescaler, or by an external clock source on
the Tn pin. The Clock Select logic block controls which clock source and edge the Timer/Counter
uses to increment (or decrement) its value. The Timer/Counter is inactive when no clock source
is selected. The output from the Clock Select logic is referred to as the timer clock (clk
Tn).
The double buffered Output Compare Registers (OCRnA/B/C) are compared with the
Timer/Counter value at all time. The result of the compare can be used by the Waveform Gener-
ator to generate a PWM or variable frequency output on the Output Compare pin (OCnA/B/C).
Clock Select
Timer/Counter
D
ATA
B
U
S
OCRnA
OCRnB
ICRn
=
TCNTn
Waveform
Generation
Waveform
Generation
OCnA
OCnB
Noise
Canceler
ICPn
=
Fixed
TOP
Values
Edge
Detector
Control Logic
= 0
TOP
BOTTOM
Count
Clear
Direction
TOVn
(Int.Req.)
OCnA
(Int.Req.)
OCnB
(Int.Req.)
ICFn (Int.Req.)
TCCRnA
TCCRnB
( From Analog
Comparator Ouput )
Tn
Edge
Detector
( From Prescaler )
clk
Tn
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