- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄67966 > MC68HC05BS8FB (MOTOROLA INC) 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44 PDF資料下載
參數(shù)資料
| 型號(hào)： | MC68HC05BS8FB |
| 廠(chǎng)商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁(yè)數(shù)： | 71/128頁(yè) |
| 文件大?。?/td> | 752K |
| 代理商： | MC68HC05BS8FB |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)當(dāng)前第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)
MC68HC05BS8
MOTOROLA
6-3
TIMERS
6
6.1.1
Counter
–
Counter Register location
High byte - $18, Low byte - $19
–
Alternate Counter Register
High byte - $1A, Low byte - $1B
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 0.95
s if the internal bus clock is 4.2MHz. 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 and $19
(counter register) or $1A and $1B (counter alternate register). Reading only the least signicant
byte (LSB) of the free-running counter ($19 or $1B) receives the count value at the time of the
read. If the most signicant byte (MSB) ($18 or $1A) is read rst, the LSB ($19 or $1B) is
transferred to a buffer. This buffer value remains xed after the rst MSB read, even if the MSB is
read several times. This buffer is accessed when the LSB ($19 or $1B) is read, and thus,
completes a read sequence of the complete counter value.
Reading the Timer Counter register low byte after reading the timer Status Register clears the
timer overow ag (TOF), but reading the Counter Alternate register does not affect TOF.
Therefore, the counter alternate register can be read any time without risk of missing timer
overow interrupts due to a cleared TOF.
The free-running counter is preset 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. The value in the free-running counter repeats every 262144 internal bus
clock cycles. TOF is set when the counter overows (from $FFFF to $0000); this will cause an
interrupt if TOIE (bit 5 of TCR) is set.
In some timing control applications it may be desirable to reset the counter under software control.
When the low byte of the counter ($19 or $1B) is written to, the counter is set to its reset value of
$FFFC. The divide-by-4 prescaler is also reset and the counter resumes normal counting
operation. All of the ags and enable bits remain unaltered by this operation. If access has
previously been made to the high byte of the free-running counter ($18 or $1A), then the reset
counter operation terminates the access sequence.
TPG
45
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC705F4P | 8-BIT, OTPROM, 1.789 MHz, MICROCONTROLLER, PDIP28 |
| MC68HC705F4FB | 8-BIT, OTPROM, 1.789 MHz, MICROCONTROLLER, PQFP44 |
| MC68HC05F4FB | 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PQFP44 |
| MC68HC05F4CDW | 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PDSO28 |
| MC68HC705G4 | 8-BIT, OTPROM, 1 MHz, MICROCONTROLLER, PQFP80 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC05C0CP | 制造商:Motorola Inc 功能描述: |
| MC68HC05C12 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNITS |
| MC68HC05C12B | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNITS |
| MC68HC05C12CP | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNITS |
| MC68HC05C12P | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNITS |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。