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| 型號(hào)： | MC9S08RE8CFJ |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, 0.80 MM PITCH, MS-026BBA, LQFP-32 |
| 文件頁(yè)數(shù)： | 42/234頁(yè) |
| 文件大?。?/td> | 1743K |
| 代理商： | MC9S08RE8CFJ |
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Timer/PWM (TPM)
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
136
Freescale Semiconductor
generation of 100 percent duty cycle is not necessary). This is not a signicant limitation because the
resulting period is much longer than required for normal applications.
TPM1MODH:TPM1MODL = $0000 is a special case that should not be used with center-aligned PWM
mode. When CPWMS = 0, this case corresponds to the counter running free from $0000 through $FFFF,
but when CPWMS = 1 the counter needs a valid match to the modulus register somewhere other than at
$0000 in order to change directions from up-counting to down-counting.
Figure 10-4 shows the output compare value in the TPM channel registers (multiplied by 2), which
determines the pulse width (duty cycle) of the CPWM signal. If ELSnA = 0, the compare match while
counting up forces the CPWM output signal low and a compare match while counting down forces the
output high. The counter counts up until it reaches the modulo setting in TPM1MODH:TPM1MODL, then
counts down until it reaches zero. This sets the period equal to two times TPM1MODH:TPM1MODL.
Figure 10-4. CPWM Period and Pulse Width (ELSnA = 0)
Center-aligned PWM outputs typically produce less noise than edge-aligned PWMs because fewer I/O pin
transitions are lined up at the same system clock edge. This type of PWM is also required for some types
of motor drives.
Because the HCS08 is a family of 8-bit MCUs, the settings in the timer channel registers are buffered to
ensure coherent 16-bit updates and to avoid unexpected PWM pulse widths. Writes to any of the registers,
TPM1MODH, TPM1MODL, TPM1CnVH, and TPM1CnVL, actually write to buffer registers. Values are
transferred to the corresponding timer channel registers only after both 8-bit bytes of a 16-bit register have
been written and the timer counter overows (reverses direction from up-counting to down-counting at the
end of the terminal count in the modulus register). This TPM1CNT overow requirement only applies to
PWM channels, not output compares.
Optionally, when TPM1CNTH:TPM1CNTL = TPM1MODH:TPM1MODL, the TPM can generate a TOF
interrupt at the end of this count. The user can choose to reload any number of the PWM buffers, and they
will all update simultaneously at the start of a new period.
Writing to TPM1SC cancels any values written to TPM1MODH and/or TPM1MODL and resets the
coherency mechanism for the modulo registers. Writing to TPM1CnSC cancels any values written to the
channel value registers and resets the coherency mechanism for TPM1CnVH:TPM1CnVL.
PERIOD
PULSE WIDTH
COUNT =
COUNT = 0
OUTPUT
COMPARE
(COUNT UP)
OUTPUT
COMPARE
(COUNT DOWN)
COUNT =
TPM1MODH:TPM
TPM1C
TPM1MODH:TPM
2 x
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC9S08RE8CFJE | 功能描述:8位微控制器 -MCU 8 BIT 8K FLASH - PB FREE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC9S08RE8CFJER | 功能描述:8位微控制器 -MCU 8 BIT 8K FLASH - PB FREE RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC9S08RE8CPE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC9S08RE8DWE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC9S08RE8FDE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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