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| 型號(hào)： | MC68HC08AS32VAFN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers |
| 中文描述： | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQCC52 |
| 封裝： | PLASTIC, LCC-52 |
| 文件頁(yè)數(shù)： | 193/296頁(yè) |
| 文件大小： | 2291K |
| 代理商： | MC68HC08AS32VAFN |
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Serial Communications Interface (SCI)
I/O Registers
MC68HC08AS32A — Rev. 1
Data Sheet
MOTOROLA
Serial Communications Interface (SCI)
For More Information On This Product,
Go to: www.freescale.com
193
when data, preamble or break is queued and ready to be sent. There may be up
to 1.5 transmitter clocks of latency between queueing data, preamble, and
break and the transmission actually starting. Reset sets the TC bit.
1 = No transmission in progress
0 = Transmission in progress
SCRF — SCI Receiver Full Bit
This clearable, read-only bit is set when the data in the receive shift register
transfers to the SCI data register. SCRF can generate an SCI receiver CPU
interrupt request. When the SCRIE bit in SCC2 is set, SCRF generates a CPU
interrupt request. In normal operation, clear the SCRF bit by reading SCS1 with
SCRF set and then reading the SCDR. Reset clears SCRF.
1 = Received data available in SCDR
0 = Data not available in SCDR
IDLE — Receiver Idle Bit
This clearable, read-only bit is set when 10 or 11 consecutive logic 1s appear
on the receiver input. IDLE generates an SCI receiver CPU interrupt request if
the ILIE bit in SCC2 is also set. Clear the IDLE bit by reading SCS1 with IDLE
set and then reading the SCDR. After the receiver is enabled, it must receive a
valid character that sets the SCRF bit before an idle condition can set the IDLE
bit. Also, after the IDLE bit has been cleared, a valid character must again set
the SCRF bit before an idle condition can set the IDLE bit. Reset clears the IDLE
bit.
1 = Receiver input idle
0 = Receiver input active (or idle since the IDLE bit was cleared)
OR — Receiver Overrun Bit
This clearable, read-only bit is set when software fails to read the SCDR before
the receive shift register receives the next character. The OR bit generates an
SCI error CPU interrupt request if the ORIE bit in SCC3 is also set. The data in
the shift register is lost, but the data already in the SCDR is not affected. Clear
the OR bit by reading SCS1 with OR set and then reading the SCDR. Reset
clears the OR bit.
1 = Receive shift register full and SCRF = 1
0 = No receiver overrun
Software latency may allow an overrun to occur between reads of SCS1 and
SCDR in the flag-clearing sequence.
Figure 13-14
shows the normal
flag-clearing sequence and an example of an overrun caused by a delayed
flag-clearing sequence. The delayed read of SCDR does not clear the OR bit
because OR was not set when SCS1 was read. Byte 2 caused the overrun and
is lost. The next flag-clearing sequence reads byte 3 in the SCDR instead of
byte 2.
In applications that are subject to software latency or in which it is important to
know which byte is lost due to an overrun, the flag-clearing routine can check
the OR bit in a second read of SCS1 after reading the data register.
F
Freescale Semiconductor, Inc.
n
.
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| MC68HC08AS32A | Microcontrollers |
| MC68HC08AS32ACFU | Microcontrollers |
| MC68HC08AS32AFN | Microcontrollers |
| MC68HC08AS32 | 8-Bit Microcontroller Units (MCUs) With Embedded EEPROM For User Data Storage(8位微控制器單元(MCUs)，帶嵌入式EEPROM數(shù)據(jù)存儲(chǔ)單元) |
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| MC68HC08AZ0 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Advance Information |
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