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參數(shù)資料
| 型號： | PPXY8300A6T1 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | Pressure Sensor |
| 英文描述： | DIFFERENTIAL, PEIZORESISTIVE PRESSURE SENSOR, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 134/162頁 |
| 文件大?。?/td> | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
Freescale Semiconductor
73
The TPM has center-aligned PWM capabilities controlled by the CPWMS control bit in TPMSC. When CPWMS is set to 1, timer
counter TPMCNT changes to an up-/down-counter and all channels in the associated TPM act as center-aligned PWM channels.
When CPWMS = 0, each channel can independently be configured to operate in input capture, output compare, or buffered edge-
aligned PWM mode.
The following sections describe the main 16-bit counter and each of the timer operating modes (input capture, output compare,
edge-aligned PWM, and center-aligned PWM). Because details of pin operation and interrupt activity depend on the operating
mode, these topics are covered in the associated mode sections.
9.4.1
Counter
All timer functions are based on the main 16-bit counter (TPMCNTH:TPMCNTL). This section discusses selection of the clock
source, up-counting vs. up-/down-counting, end-of-count overflow, and manual counter reset.
After any MCU reset, CLKSB:CLKSA = 0:0 so no clock source is selected and the TPM is inactive. Normally, CLKSB:CLKSA
would be set to 0:1 so the bus clock drives the timer counter. The clock source for each of the TPM can be independently selected
to be off, the bus clock (BUSCLK), the fixed system clock (XCLK), or an external input. The maximum frequency allowed for the
external clock option is one-fourth the bus rate. Refer to Section 9.3.1 and Table 9-4 for more information about clock source
selection.
When the microcontroller is in active background mode, the TPM temporarily suspends all counting until the microcontroller
returns to normal user operating mode. During stop mode, all TPM clocks are stopped; therefore, the TPM is effectively disabled
until clocks resume. During wait mode, the TPM continues to operate normally.
The main 16-bit counter has two counting modes. When center-aligned PWM is selected (CPWMS = 1), the counter operates in
up-/down-counting mode. Otherwise, the counter operates as a simple up-counter. As an up-counter, the main 16-bit counter
counts from 0x0000 through its terminal count and then continues with 0x0000. The terminal count is 0xFFFF or a modulus value
in TPMMODH:TPMMODL.
When center-aligned PWM operation is specified, the counter counts upward from 0x0000 through its terminal count and then
counts downward to 0x0000 where it returns to up-counting. Both 0x0000 and the terminal count value (value in
TPMMODH:TPMMODL) are normal length counts (one timer clock period long).
An interrupt flag and enable are associated with the main 16-bit counter. The timer overflow flag (TOF) is a software-accessible
indication that the timer counter has overflowed. The enable signal selects between software polling (TOIE = 0) where no
hardware interrupt is generated, or interrupt-driven operation (TOIE = 1) where a static hardware interrupt is automatically
generated whenever the TOF flag is 1.
The conditions that cause TOF to become set depend on the counting mode (up or up/down). In up-counting mode, the main 16-
bit counter counts from 0x0000 through 0xFFFF and overflows to 0x0000 on the next counting clock. TOF becomes set at the
transition from 0xFFFF to 0x0000. When a modulus limit is set, TOF becomes set at the transition from the value set in the
modulus register to 0x0000. When the main 16-bit counter is operating in up-/down-counting mode, the TOF flag gets set as the
counter changes direction at the transition from the value set in the modulus register and the next lower count value. This
corresponds to the end of a PWM period. (The 0x0000 count value corresponds to the center of a period.)
Because the HCS08 MCU is an 8-bit architecture, a coherency mechanism is built into the timer counter for read operations.
Whenever either byte of the counter is read (TPMCNTH or TPMCNTL), both bytes are captured into a buffer so when the other
byte is read, the value will represent the other byte of the count at the time the first byte was read. The counter continues to count
normally, but no new value can be read from either byte until both bytes of the old count have been read.
The main timer counter can be reset manually at any time by writing any value to either byte of the timer count TPMCNTH or
TPMCNTL. Resetting the counter in this manner also resets the coherency mechanism in case only one byte of the counter was
read before resetting the count.
9.4.2
Provided CPWMS = 0 (center-aligned PWM operation is not specified), the MSnB and MSnA control bits in the channel n status
and control registers determine the basic mode of operation for the corresponding channel. Choices include input capture, output
compare, and buffered edge-aligned PWM.
9.4.2.1
Input Capture Mode
With the input capture function, the TPM can capture the time at which an external event occurs. When an active edge occurs
on the pin of an input capture channel, the TPM latches the contents of the TPM counter into the channel value registers
(TPMCnVH:TPMCnVL). Rising edges, falling edges, or any edge may be chosen as the active edge that triggers an input
capture.
When either byte of the 16-bit capture register is read, both bytes are latched into a buffer to support coherent 16-bit accesses
regardless of order. The coherency sequence can be manually reset by writing to the channel status/control register (TPMCnSC).
An input capture event sets a flag bit (CHnF) that can optionally generate a CPU interrupt request.
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相關代理商/技術參數(shù) |
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| PPYY12C0.75 | 制造商:Farnell / Pro-Power 功能描述:CABLE YY 12 CORE 0.75MM PER M 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 0.75MM, PER M 制造商:PRIVATE LABEL 功能描述:CABLE, YY, 12 CORE, 0.75MM, PER M, No. of Conductors:12, Voltage Rating:500V, No 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 0.75MM, PER M, No. of Conductors:12, Voltage Rating:500V, No. of Max Strands x Strand Size:-, Conductor Area CSA:0.75mm2, Jacket Colour:Grey, Jacket Material:PVC (Polyvinyl Chloride), External Diameter:9.9mm, |
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| PPYY12C0.75 50M | 制造商:Farnell / Pro-Power 功能描述:CABLE YY 12 CORE 0.75MM 50M 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 0.75MM, 50M |
| PPYY12C1.50 | 制造商:Farnell / Pro-Power 功能描述:CABLE YY 12 CORE 1.5MM PER M 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 1.5MM, PER M |
| PPYY12C1.50 50M | 制造商:Farnell / Pro-Power 功能描述:CABLE YY 12 CORE 1.5MM 50M 制造商:pro-power 功能描述:CABLE, YY, 12 CORE, 1.5MM, 50M |
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