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參數(shù)資料
| 型號(hào)： | MC68HC08GP16ACFB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 10 X 10 MM, 0.80 MM PITCH, PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 54/258頁(yè) |
| 文件大?。?/td> | 1855K |
| 代理商： | MC68HC08GP16ACFB |
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Functional Description
MC68HC08GP32A MC68HC08GP16A Data Sheet, Rev. 1.0
Freescale Semiconductor
147
For an 8-bit character, data sampling of the stop bit takes the receiver
9bit times
× 16 RT cycles + 10 RT cycles = 154 RT cycles.
With the misaligned character shown in Figure 14-9, the receiver counts 154 RT cycles at the point when
the count of the transmitting device is 10 bit times
× 16 RT cycles = 160 RT cycles.
The maximum percent difference between the receiver count and the transmitter count of a fast 8-bit
character with no errors is
For a 9-bit character, data sampling of the stop bit takes the receiver
10 bit times
× 16 RT cycles + 10 RT cycles = 170 RT cycles.
With the misaligned character shown in Figure 14-9, the receiver counts 170 RT cycles at the point when
the count of the transmitting device is 11 bit times
× 16 RT cycles = 176 RT cycles.
The maximum percent difference between the receiver count and the transmitter count of a fast 9-bit
character with no errors is
14.4.3.6 Receiver Wakeup
So that the MCU can ignore transmissions intended only for other receivers in multiple-receiver systems,
the receiver can be put into a standby state. Setting the receiver wakeup bit, RWU, in SCC2 puts the
receiver into a standby state during which receiver interrupts are disabled.
Depending on the state of the WAKE bit in SCC1, either of two conditions on the PTE1/RxD pin can bring
the receiver out of the standby state:
Address mark — An address mark is a 1 in the most significant bit position of a received character.
When the WAKE bit is set, an address mark wakes the receiver from the standby state by clearing
the RWU bit. The address mark also sets the SCI receiver full bit, SCRF. Software can then
compare the character containing the address mark to the user-defined address of the receiver. If
they are the same, the receiver remains awake and processes the characters that follow. If they
are not the same, software can set the RWU bit and put the receiver back into the standby state.
Idle input line condition — When the WAKE bit is clear, an idle character on the PTE1/RxD pin
wakes the receiver from the standby state by clearing the RWU bit. The idle character that wakes
the receiver does not set the receiver idle bit, IDLE, or the SCI receiver full bit, SCRF. The idle line
type bit, ILTY, determines whether the receiver begins counting 1s as idle character bits after the
start bit or after the stop bit.
NOTE
With the WAKE bit clear, setting the RWU bit after the RxD pin has been
idle may cause the receiver to wake up immediately.
154
160
–
154
--------------------------
100
×
3.90%
=
170
176
–
170
--------------------------
100
×
3.53%
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC08GP16ACB | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PDIP42 |
| MC68HC08GP16AMFB | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| MC68HC08GP16AVFB | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44 |
| MC68HC08GP32VB | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PDIP42 |
| MC68HC908GP32CB | 8-BIT, FLASH, 8.2 MHz, MICROCONTROLLER, PDIP42 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC08GP16AMB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC08GP16AMFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC08GP16AVB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC08GP16AVFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC08GP32 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:M68HC08 Family of 8-bit microcontroller units (MCUs) |
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