clk_I/O/8)<" />
參數(shù)資料
型號: ATTINY2313A-SUR
廠商: Atmel
文件頁數(shù): 10/172頁
文件大?。?/td> 0K
描述: MCU AVR 2KB FLASH 20MHZ 20SOIC
產(chǎn)品培訓(xùn)模塊: tinyAVR Introduction
標(biāo)準(zhǔn)包裝: 1,000
系列: AVR® ATtiny
核心處理器: AVR
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 18
程序存儲器容量: 2KB(1K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 128 x 8
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 帶卷 (TR)
其它名稱: ATTINY2313A-SUR-ND
107
8246B–AVR–09/11
ATtiny2313A/4313
Figure 12-13. Timer/Counter Timing Diagram, with Prescaler (f
clk_I/O/8)
12.10 Accessing 16-bit Registers
The TCNT1, OCR1A/B, and ICR1 are 16-bit registers that can be accessed by the AVR CPU via
the 8-bit data bus. The 16-bit register must be byte accessed using two read or write operations.
Each 16-bit timer has a single 8-bit register for temporary storing of the high byte of the 16-bit
access. The same temporary register is shared between all 16-bit registers within each 16-bit
timer. Accessing the low byte triggers the 16-bit read or write operation. When the low byte of a
16-bit register is written by the CPU, the high byte stored in the temporary register, and the low
byte written are both copied into the 16-bit register in the same clock cycle. When the low byte of
a 16-bit register is read by the CPU, the high byte of the 16-bit register is copied into the tempo-
rary register in the same clock cycle as the low byte is read.
Not all 16-bit accesses uses the temporary register for the high byte. Reading the OCR1A/B 16-
bit registers does not involve using the temporary register.
To do a 16-bit write, the high byte must be written before the low byte. For a 16-bit read, the low
byte must be read before the high byte.
The following code examples show how to access the 16-bit timer registers assuming that no
interrupts updates the temporary register. The same principle can be used directly for accessing
TOVn(FPWM)
and ICF n(if used
as TOP)
OCRnx
(Update at TOP)
TCNTn
(CTC and FPWM)
TCNTn
(PC and PFC PWM)
TOP - 1
TOP
TOP - 1
TOP - 2
Old OCRnx Value
New OCRnx Value
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O/8)
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