- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45221 > MC68HC05P18CP (MOTOROLA INC) 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 PDF資料下載
參數(shù)資料
| 型號： | MC68HC05P18CP |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 131/144頁 |
| 文件大?。?/td> | 1348K |
| 代理商： | MC68HC05P18CP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁當前第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁
16-Bit Timer
Timer
MC68HC(8)05P18 — Rev. 2.0
Advance Information
MOTOROLA
16-Bit Timer
87
Because the timer has a 16-bit architecture, each function is represented
by two registers. Each register pair contains the high and low byte of that
function. Generally, accessing the low byte of a specific timer function
allows full control of that function; however, an access of the high byte
inhibits that specific timer function until the low byte is also accessed.
NOTE:
The I bit in the condition code register (CCR) should be set while
manipulating both the high and low byte registers of a specific timer
function. This prevents interrupts from occurring between the time the
high and low bytes are accessed.
10.3 Timer
The key element of the programmable timer is a 16-bit free-running
counter, or timer registers, preceded by a prescaler which divides the
PH2 clock by four. The prescaler gives the timer a resolution of 2.0
microseconds when a 4-MHz crystal is used. The counter is incremented
to increasing values during the low portion of the PH2 clock cycle.
The double byte free-running counter can be read from either of two
locations: the timer registers (TMRH and TMRL) or the alternate counter
registers (ACRH and ACRL). Both locations will contain identical values.
A read sequence containing only a read of the LSB of the counter
(TMRL/ACRL) will return the count value at the time of the read. If a read
of the counter accesses the MSB first (TMRH/ACRH), it causes the LSB
(TMRL/ACRL) to be transferred to a buffer. This buffer value remains
fixed after the first MSB byte read, even if the MSB is read several times.
The buffer is accessed when reading the counter LSB (TMRL/ACRL)
and thus completes a read sequence of the total counter value. When
reading either the timer or alternate counter registers, if the MSB is read,
the LSB must also be read to complete the read sequence. See
Figure 10-2 and Figure 10-3.
相關PDF資料 |
PDF描述 |
|---|---|
| MC68HC05P18MP | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| MC68HC05P18MDW | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
| MC68HC05P1AP | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| MC68HCL05P1ADW | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
| MC68HC05P2CFN | 8-BIT, MROM, MICROCONTROLLER, PQCC32 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC05P1A | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification |
| MC68HC05P1ADW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification |
| MC68HC05P1AP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification |
| MC68HC05P1CDW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05P1CP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
發(fā)布緊急采購，3分鐘左右您將得到回復。