參數(shù)資料
型號(hào)： MC68HC705E6CFB
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封裝： QFP-44
文件頁數(shù)： 91/140頁
文件大?。?/td> 1141K
代理商： MC68HC705E6CFB
Programmable Timer
MC68HC05E6 — Rev. 1.0
54
Programmable Timer
MOTOROLA
Counter high
register, Counter
low register,
Alternate counter
high register,
Alternate counter
low register
The double-byte, free-running counter can be read from either of two
locations, the counter register at $18 – $19 or the alternate counter
register at $1A – $1B. A read from only the less significant byte (LSB) of
the free-running counter, $19 or $1B, receives the count value at the
time of the read. If a read of the free-running counter or alternate counter
register first addresses the more significant byte (MSB), $18 or $1A, the
LSB is transferred to a buffer. This buffer value remains fixed after the
first MSB read, even if the user reads the MSB several times. This buffer
is accessed when reading the free-running counter or alternate counter
register LSB and thus completes a read sequence of the total counter
value. In reading either the free-running counter or alternate counter
register, if the MSB is read, the LSB must also be read to complete the
sequence. If the timer overflow flag (TOF) is set when the counter
register LSB is read, then a read of the TSR will clear the flag.
The alternate counter register differs from the counter register only in
that a read of the LSB does not clear TOF. Therefore, to avoid the
possibility of missing timer overflow interrupts due to clearing of TOF, the
alternate counter register should be used where this is a critical issue.
The free-running counter is set to $FFFC during reset and is always a
read-only register. During a power-on reset, the counter is also preset to
$FFFC and begins running after the oscillator start-up delay. Because
the free-running counter is 16 bits preceded by a fixed divide-by-four
prescaler, the value in the free-running counter repeats every 262144
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Timer counter high (TCH)
$0018 (bit 15)
(bit 8) 1111 1111
Timer counter low (TCL)
$0019
1111 1100
Alternate counter high (ACH)
$001A (bit 15)
(bit 8) 1111 1111
Alternate counter low (ACL)
$001B
1111 1100
4-ptimer
相關(guān)PDF資料
PDF描述
MC68HC705E6VDWR2 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC05E6VFB 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
MC68HC705E6VDW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705E6VDWR3 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705E6MDWR2 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC705G1B 制造商:Rochester Electronics LLC 功能描述:- Bulk
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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(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)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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