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| 型號(hào)： | MM912H634CM1AE |
| 廠(chǎng)商： | Freescale Semiconductor |
| 文件頁(yè)數(shù)： | 348/349頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC 64KS12 LIN2XLS/HS ISENSE |
| 標(biāo)準(zhǔn)包裝： | 250 |
| 應(yīng)用： | 自動(dòng) |
| 核心處理器： | HCS12 |
| 程序存儲(chǔ)器類(lèi)型： | 閃存（64 kB） |
| 控制器系列： | HCS12 |
| RAM 容量： | 6K x 8 |
| 接口： | LIN |
| 電源電壓： | 5.5 V ~ 27 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP 裸露焊盤(pán) |
| 包裝： | 管件 |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP 裸露焊盤(pán)（7x7） |
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PWM Control Module (PWM8B2C)
MM912_634 Advance Information, Rev. 10.0
Freescale Semiconductor
98
In this way, the output of the PWM will always be either the old waveform or the new waveform, not some variation in between.
If the channel is not enabled, then writes to the period and duty registers will go directly to the latches as well as the buffer.
A change in duty or period can be forced into effect “immediately” by writing the new value to the duty and/or period registers,
and then writing to the counter. This forces the counter to reset and the new duty and/or period values to be latched. In addition,
since the counter is readable, it is possible to know where the count is with respect to the duty value, and software can be used
to make adjustments
NOTE
When forcing a new period or duty into effect immediately, an irregular PWM cycle can occur.
Depending on the polarity bit, the duty registers will contain the count of either the high time
or the low time.
5.14.4.2.4
PWM Timer Counters
Each channel has a dedicated 8-bit up/down counter which runs at the rate of the selected clock source (see Section 5.14.4.1,
“PWM Clock Select" for the available clock sources and rates). The counter compares to two registers, a duty register and a
period register as shown in Figure 24. When the PWM counter matches the duty register, the output flip-flop changes state,
causing the PWM waveform to also change state. A match between the PWM counter and the period register behaves differently
depending on what output mode is selected as shown in Figure 24 and described in Section 5.14.4.2.5, “Left Aligned Outputs"
Each channel counter can be read at anytime without affecting the count or the operation of the PWM channel.
Any value written to the counter causes the counter to reset to $00, the counter direction to be set to up, the immediate load of
both duty and period registers with values from the buffers, and the output to change according to the polarity bit. When the
channel is disabled (PWMEx = 0), the counter stops. When a channel becomes enabled (PWMEx = 1), the associated PWM
counter continues from the count in the PWMCNTx register. This allows the waveform to continue where it left off when the
channel is re-enabled. When the channel is disabled, writing “0” to the period register will cause the counter to reset on the next
selected clock.
NOTE
To start a new “clean” PWM waveform without any “history” from the old waveform, writing
the channel counter (PWMCNTx) must happen prior to enabling the PWM channel
(PWMEx = 1).
Generally, writes to the counter are done prior to enabling a channel in order to start from a known state. However, writing a
counter can also be done while the PWM channel is enabled (counting). The effect is similar to writing the counter when the
channel is disabled, except that the new period is started immediately with the output set according to the polarity bit.
NOTE
Writing to the counter while the channel is enabled can cause an irregular PWM cycle to
occur.
The counter is cleared at the end of the effective period (see Section 5.14.4.2.5, “Left Aligned Outputs" and Section 5.14.4.2.6,
“Center Aligned Outputs" for more details).
5.14.4.2.5
Left Aligned Outputs
The PWM timer provides the choice of two types of outputs, left aligned or center aligned. They are selected with the CAEx bits
in the PWMCTL register. If the CAEx bit is cleared (CAEx = 0), the corresponding PWM output will be left aligned.
In left aligned output mode, the 8-bit counter is configured as an up counter only. It compares to two registers, a duty register and
a period register as shown in the block diagram in Figure 24. When the PWM counter matches the duty register the output flip-flop
changes state causing the PWM waveform to also change state. A match between the PWM counter and the period register
resets the counter and the output flip-flop, as shown in Figure 24, as well as performing a load from the double buffer period and
duty register to the associated registers, as described in Section 5.14.4.2.3, “PWM Period and Duty". The counter counts from 0
to the value in the period register – 1.
Table 130. PWM Timer Counter Conditions
Counter Clears ($00)
Counter Counts
Counter Stops
When PWMCNTx register written to any value When PWM channel is enabled (PWMEx = 1).
Counts from last value in PWMCNTx.
When PWM channel is disabled (PWMEx = 0)
Effective period ends
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AYF213735 | CONN FPC 0.2MM 37POS SMD R/A |
| 396-030-520-202 | CARD EDGE 30POS DL .125X.250 BLK |
| 396-030-520-201 | CARD EDGE 30POS DL .125X.250 BLK |
| MM912G634CM1AER2 | IC 48KS12 LIN2XLS/HS ISENSE |
| 345-026-540-802 | CARDEDGE 26POS DUAL .100 GREEN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MM912H634CM1AER2 | 功能描述:LIN 收發(fā)器 64KS12 LIN2xLS/HS Isense RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8 |
| MM912H634CV1AE | 功能描述:LIN 收發(fā)器 64KS12 LIN2xLS/HS Isense RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8 |
| MM912H634CV1AER2 | 功能描述:LIN 收發(fā)器 64KS12 LIN2xLS/HS Isense RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8 |
| MM912H634DM1AE | 功能描述:16位微控制器 - MCU 64KS12 LIN2XLS/HS ISENSE RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線(xiàn)寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
| MM912H634DM1AER2 | 功能描述:16位微控制器 - MCU 64KS12 LIN2XLS/HS ISENSE RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線(xiàn)寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
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