參數(shù)資料
型號： MC68HC705JP7CDW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝： SOIC-28
文件頁數(shù)： 10/164頁
文件大小： 1165K
代理商： MC68HC705JP7CDW
Timer Registers
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
Freescale Semiconductor
107
11.2 Timer Registers
The functional block diagram of the 16-bit free-running timer counter and timer registers is shown in
Figure 11-2. The timer registers include a transparent buffer latch on the LSB of the 16-bit timer counter.
Figure 11-2. Programmable Timer Block Diagram
The timer registers (TMRH and TMRL) shown in Figure 11-3 are read-only locations which contain the
current high and low bytes of the 16-bit free-running counter. Writing to the timer registers has no effect.
Reset of the device presets the timer counter to $FFFC.
The TMRL latch is a transparent read of the LSB until a read of the TMRH takes place. A read of the
TMRH latches the LSB into the TMRL location until the TMRL is again read. The latched value remains
fixed even if multiple reads of the TMRH take place before the next read of the TMRL. Therefore, when
reading the MSB of the timer at TMRH, the LSB of the timer at TMRL must also be read to complete the
read sequence.
During power-on reset (POR), the counter is initialized to $FFFC and begins counting after the oscillator
startup delay. Because the counter is 16 bits and preceded by a fixed prescaler, the value in the counter
repeats every 262,144 internal bus clock cycles (524,288 oscillator cycles).
Address:
$0018
Bit 7
654321
Bit 0
Read:
Bit 15
14
13
12
11
10
9
Bit 8
Write:
Reset:
11111111
Address:
$0018
Bit 7
654321
Bit 0
Read:
Bit 7
654321
Bit 0
Write:
Reset:
11111100
= Unimplemented
Figure 11-3. Programmable Timer Registers (TMRH and TMRL)
TO
IE
TMRH ($0018)
TMR LSB
16-BIT COUNTER
÷ 4
INTERNAL
(OSC
÷ 2)
TIMER CONTROL REG.
TIMER
REQUEST
OVERFLOW (TOF)
RESET
CLOCK
INTERRUPT
TMRL ($0019)
TO
F
TIMER STATUS REG.
$0012
$0013
INTERNAL
$FFFC
DATA
READ
TMRH
READ
TMRL
READ
LATCH
BUS
相關PDF資料
PDF描述
MC68HC705JJ7CDW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
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相關代理商/技術參數(shù)
參數(shù)描述
MC68HC705JP7CP 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述:
MC68HC705K1CDW 制造商:Motorola Inc 功能描述:
MC68HC705KJ1CDW 功能描述:8位微控制器 -MCU 8 Bit 4MHz RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
MC68HC705KJ1CP 功能描述:IC MCU 4MHZ 1.2K OTP 16-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標準包裝: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
MC68HC705L32FU 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述:
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