參數(shù)資料
型號: MC68HC705G4
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 123/128頁
文件大?。?/td> 290K
代理商: MC68HC705G4
Page 84
MOTOROLA
Section 8: TIMER SYSTEM
MC68HC05G3 (705G4) Specification Rev. 1.1
8.2
TIMER 2
Timer 2 is an 8-bit event counter which has one compare register, event input pin (EVI),
and event output pin (EVO). The event counter is clocked by the external clock (EXCLK)
or prescaled system clock (CLK2) that is selected by the T2CLK bit in the TCR2 register.
The EXCLK may be EVI direct or EVI gated by CLK2, which is selected by the IM2 bit at
the EVI block. (Refer to the EVI description.)
Timer 2 may be used as a modulus clock divider with EVO pin, free-running counter (when
compare register is $00), or periodic interrupt timer.
The timer counter 2 is an 8-bit up counter with preset input. The counter is preset to $01 by
the CMP2 signal from the comparator or a CPU write to this counter (TCNT2), done while
the system clock (PHI2) is low.
The CLK2 from the prescaler or the EXTCLK from the EVI block are selected as timer clock
by the T2CLK bit in the TCR2 register. The CLK2 and the EXCLK are synchronized to the
falling edge of system clock in the prescaler and the EVI blocks. The minimum pulse width
of CLK2 is the same as the system clock, and the minimum pulse width of EXCLK (event
mode) is one PHI2 cycle. When the EXCLK (event mode) is selected, 50% duty is not
guaranteed.
Figure 8-3: Timer 2 Block Diagram
The counter is incremented by the falling edge of the timer clock and the period between
two falling edges is defined as one timer cycle in the following description.
The compare register (OC2) is provided for the comparison with the timer counter. The
OC2 data is transferred to the buffer register when the counter is preset by the CPU write
or the compare output (CMP2). Actually, this buffer register is compared with the timer
counter.
COUNTER 2
COMPARATOR 2
REGISTER (OC2)
BUFFER 2
S
E
L
(TRANSFER)
($01)
0
1
COUNTER
WRITE
CLK2
EXCLK
T2CLK
CMP2
TIMCLK
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC705J1A 制造商:Freescale Semiconductor 功能描述:
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MC68HC705J1ACP 功能描述:IC MCU 4MHZ 1.2K OTP 20-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:HC05 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C,IrDA,LIN,SPI,UART/USART 外圍設(shè)備:DMA,PDR,POR,PVD,PWM,溫度傳感器,WDT 輸入/輸出數(shù):26 程序存儲器容量:64KB(64K x 8) 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN,36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND
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MC68HC705J2CDW 制造商:Motorola Inc 功能描述: 制造商:Motorola Inc 功能描述:MicroController, 8-Bit, 20 Pin, Plastic, SOP