欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數(shù)資料
型號: MC68HC05C8A
廠商: Motorola, Inc.
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 61/158頁
文件大小: 773K
代理商: MC68HC05C8A
Timer
Counter
MC68HC05C8A
MC68HCL05C8A
MC68HSC05C8A
Rev. 5.0
Technical Data
MOTOROLA
Timer
61
8.3 Counter
The key element in the programmable timer is a 16-bit, free-running
counter or counter register, preceded by a prescaler that divides the
internal processor clock by four. The prescaler gives the timer a
resolution of 2.0 microseconds if the internal bus clock is 2.0 MHz. The
counter is incremented during the low portion of the internal bus clock.
Software can read the counter at any time without affecting its value.
The double-byte, free-running counter can be read from either of two
locations, $18, $19 (counter register) or $1A, $1B (counter alternate
register). A read from only the least significant byte (LSB) of the free-
running counter ($19, $1B) receives the count value at the time of the
read. If a read of the free-running counter or counter alternate register
first addresses the most significant byte (MSB) ($18, $1A), the LSB ($19,
$1B) 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 counter alternate
register LSB ($19 or $1B) and, thus, completes a read sequence of the
total counter value. In reading either the free-running counter or counter
alternate register, if the MSB is read, the LSB must also be read to
complete the sequence.
The counter alternate register differs from the counter register in one
respect: A read of the counter register MSB can clear the timer overflow
flag (TOF). Therefore, the counter alternate register can be read at any
time without the possibility of missing timer overflow interrupts due to
clearing of the TOF.
The free-running counter is configured 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
262,144 internal bus clock cycles. When the counter rolls over from
$FFFF to $0000, the TOF bit is set. An interrupt can also be enabled
whenever counter rollover occurs by setting its interrupt enable bit
(TOIE).
相關(guān)PDF資料
PDF描述
MC68HC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HCL05C9A 8-Bit Microcontroller(8位微控制器)
MC68HSC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HC05F2 8-Bit Microcontroller Units (MCU).(8位微控制器)
MC68HC05F6 8-Bit Microcontroller Units (MCU).(8位微控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC05C8ACFN 制造商:Motorola Inc 功能描述:MicroController, 8-Bit, 44 Pin, Plastic, PLCC
MC68HC05C9 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:TECHNICAL DATA
MC68HC05C9A 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AFB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
主站蜘蛛池模板: 鄂尔多斯市| 横峰县| 桃园市| 平舆县| 和静县| 突泉县| 温宿县| 罗定市| 饶河县| 饶阳县| 镇赉县| 嵊泗县| 雷波县| 虹口区| 舟曲县| 清流县| 大关县| 大田县| 班戈县| 瑞安市| 张家界市| 上杭县| 贡觉县| 渭源县| 搜索| 荣昌县| 花莲市| 梨树县| 河南省| 海安县| 南京市| 理塘县| 泰顺县| 安福县| 左权县| 桑植县| 朝阳区| 聊城市| 卓资县| 仁怀市| 沙坪坝区|