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參數(shù)資料
| 型號： | DEMO9RS08KA2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 132/136頁 |
| 文件大小： | 0K |
| 描述： | DEMO BOARD FOR 9RS08KA2 |
| 產(chǎn)品培訓(xùn)模塊： | Mechatronics USBSpyder08 Discovery Kit RS08KA2 Low-End Microcontroller Series MC9RS08KA8 Microcontroller |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | RS08 |
| 類型： | MCU |
| 適用于相關(guān)產(chǎn)品： | MC9RS08KA2 |
| 所含物品： | 板，線纜，CD，文檔，樣品 IC |
| 產(chǎn)品目錄頁面： | 730 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | MC9RS08KA2CSCRTR-ND - IC MCU 8BIT 2K FLASH 8-SOIC PC9RS08KA2PAE-ND - MCU 8BIT 2KB FLASH RS08 8-DIP PC9RS08KA2FPE-ND - MCU 8BIT 2KB FLASH RS08 6-VDFN PC9RS08KA2DWE-ND - MCU 8BIT 2KB FLASH RS08 8-SOIC MC9RS08KA2CPC-ND - IC MCU 8-BIT 2K FLASH 8-PDIP MC9RS08KA2CDB-ND - IC MCU 8-BIT 2K FLASH 6-DFN MC9RS08KA2CSC-ND - IC MCU 8-BIT 2K FLASH 8-SOIC |
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Modulo Timer (RS08MTIMV1)
MC9RS08KA2 Series Data Sheet, Rev. 4
Freescale Semiconductor
95
11.4
Functional Description
The MTIM is composed of a main 8-bit up-counter with an 8-bit modulo register, a clock source selector,
and a prescaler block with nine selectable values. The module also contains software selectable interrupt
logic.
The MTIM counter (MTIMCNT) has three modes of operation: stopped, free-running, and modulo. Out
of reset, the counter is stopped. If the counter is started without writing a new value to the modulo register,
then the counter will be in free-running mode. The counter is in modulo mode when a value other than $00
is in the modulo register while the counter is running.
After any MCU reset, the counter is stopped and reset to $00, and the modulus is set to $00. The bus clock
is selected as the default clock source and the prescale value is divide by 1. To start the MTIM in
free-running mode, simply write to the MTIM status and control register (MTIMSC) and clear the MTIM
stop bit (TSTP).
Four clock sources are software selectable: the internal bus clock, the fixed frequency clock (XCLK), and
an external clock on the TCLK pin, selectable as incrementing on either rising or falling edges. The MTIM
clock select bits (CLKS) in MTIMCLK are used to select the desired clock source. If the counter is active
(TSTP = 0) when a new clock source is selected, the counter will continue counting from the previous
value using the new clock source.
Nine prescale values are software selectable: clock source divided by 1, 2, 4, 8, 16, 32, 64, 128, or 256.
The prescaler select bits (PS) in MTIMCLK select the desired prescale value. If the counter is active
(TSTP = 0) when a new prescaler value is selected, the counter will continue counting from the previous
value using the new prescaler value.
The MTIM modulo register (MTIMMOD) allows the overflow compare value to be set to any value from
$01 to $FF. Reset clears the modulo value to $00, which results in a free running counter.
When the counter is active (TSTP = 0), the counter increments at the selected rate until the count matches
the modulo value. When these values match, the counter overflows to $00 and continues counting. The
MTIM overflow flag (TOF) is set whenever the counter overflows. The flag sets on the transition from the
modulo value to $00. Writing to MTIMMOD while the counter is active resets the counter to $00 and
clears TOF.
Clearing TOF is a two-step process. The first step is to read the MTIMSC register while TOF is set. The
second step is to write a 0 to TOF. If another overflow occurs between the first and second steps, the
clearing process is reset and TOF will remain set after the second step is performed. This will prevent the
second occurrence from being missed. TOF is also cleared when a 1 is written to TRST or when any value
is written to the MTIMMOD register.
The MTIM allows for an optional interrupt to be generated whenever TOF is set. To enable the MTIM
overflow interrupt, set the MTIM overflow interrupt enable bit (TOIE) in MTIMSC. TOIE must never be
written to a 1 while TOF = 1. Instead, TOF must be cleared first, then the TOIE can be set to 1.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DEMO9RS08KA8 | 功能描述:開發(fā)板和工具包 - S08 / S12 DEMO BOARD FOR KA8 PRODUCT RoHS:否 產(chǎn)品:Development Kits 工具用于評估:MC9S12G128 核心:S12 接口類型:CAN, LIN, RS-232, USB 工作電源電壓:5 V 制造商:Freescale Semiconductor |
| DEMO9RS08KB12 | 功能描述:開發(fā)板和工具包 - S08 / S12 KB12 DEMO Board RoHS:否 產(chǎn)品:Development Kits 工具用于評估:MC9S12G128 核心:S12 接口類型:CAN, LIN, RS-232, USB 工作電源電壓:5 V 制造商:Freescale Semiconductor |
| DEMO9RS08KB12 | 制造商:Freescale Semiconductor 功能描述:; LEADED PROCESS COMPATIBLE:YES; PEAK RE |
| DEMO9RS08LA8 | 功能描述:開發(fā)板和工具包 - S08 / S12 DEMO BOARD FOR LA8 RoHS:否 產(chǎn)品:Development Kits 工具用于評估:MC9S12G128 核心:S12 接口類型:CAN, LIN, RS-232, USB 工作電源電壓:5 V 制造商:Freescale Semiconductor |
| DEMO9RS08LE4 | 功能描述:開發(fā)板和工具包 - S08 / S12 LE4 Family Demo Board RoHS:否 產(chǎn)品:Development Kits 工具用于評估:MC9S12G128 核心:S12 接口類型:CAN, LIN, RS-232, USB 工作電源電壓:5 V 制造商:Freescale Semiconductor |
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