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參數(shù)資料
| 型號： | MC68HC11A1MFN2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52 |
| 封裝： | PLASTIC, LCC-52 |
| 文件頁數(shù)： | 110/158頁 |
| 文件大?。?/td> | 3803K |
| 代理商： | MC68HC11A1MFN2 |
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SERIAL COMMUNICATIONS INTERFACE
MOTOROLA
TECHNICAL DATA
5-11
5
NF — Noise Flag
The noise flag bit is set if there is noise on any of the received bits, including the start
and stop bits. The NF bit is not set until the RDRF flag is set. The NF bit is cleared
when the SCSR is read (with NF set), followed by a read of the SCDR.
FE — Framing Error
The framing error bit is set when no stop bit was detected in the received data charac-
ter. The FE bit is set at the same time as the RDRF is set. If the byte received causes
both framing and overrun errors, the processor will only recognize the overrun error.
The framing error flag inhibits further transfer of data into the SCDR until it is cleared.
The FE bit is cleared when the SCSR is read (with FE equal to one) followed by a read
of the SCDR.
Bit 0 — Not Implemented
This bit always reads zero.
5.8.5 Baud Rate Register (BAUD)
The baud rate register selects the different baud rates which may be used as the rate
control for the transmitter and receiver. The SCP[0:1] bits function as a prescaler for
the SCR[0:2] bits. Together, these five bits provide multiple baud rate combinations for
a given crystal frequency.
TCLR — Clear Baud Rate Counters (Test)
This bit is used to clear the baud rate counter chain during factory testing. TCLR is
zero and cannot be set while in normal operating modes.
SCP1 and SCP0 — SCI Baud Rate Prescaler Selects
The E clock is divided by the factors shown in Table 5-1. This prescaled output pro-
vides an input to a divider which is controlled by the SCR2-SCR0 bits.
SCR2, SCR1, and SCR0 — SCI Baud Rate Selects
These three bits select the baud rates for both the transmitter and the receiver. The
prescaler output described above is further divided by the factors shown in Table 5-2.
7
6543210
$102B
TCLR
0
SCP1
SCP0
RCKB
SCR2
SCR1
SCR0
BAUD
RESET
00000
U
Table 5-1 First Prescaler Stage
SCP1
SCP0
Internal Processor Clock Divided By
00
1
01
3
10
4
11
13
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC11A1MFNE | 功能描述:8位微控制器 -MCU 8B MCU 256RAM A/D EE 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| MC68HC11A1MFNER | 功能描述:8位微控制器 -MCU 8B MCU 256RAM A/D EE 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| MC68HC11A1MFU2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller |
| MC68HC11A1MP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers |
| MC68HC11A1MP2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller |
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