参数资料
型号: MC68HC11F1CFN4
厂商: Freescale Semiconductor
文件页数: 153/158页
文件大小: 0K
描述: IC MCU 512 EEPROM 4MHZ 68-PLCC
标准包装: 18
系列: HC11
核心处理器: HC11
芯体尺寸: 8-位
速度: 4MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 30
程序存储器类型: ROMless
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.75 V ~ 5.25 V
数据转换器: A/D 8x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 68-LCC(J 形引线)
包装: 管件
SERIAL COMMUNICATIONS INTERFACE
MC68HC11F1
7-8
TECHNICAL DATA
OR — Overrun Error Flag
OR is set if a new character is received before a previously received character is read
from SCDR. Clear the OR flag by reading SCSR and then reading SCDR.
0 = No overrun
1 = Overrun detected
NF — Noise Error Flag
NF is set if majority sample logic detects anything other than a unanimous decision.
Clear NF by reading SCSR and then reading SCDR.
0 = Unanimous decision
1 = Noise detected
FE — Framing Error
FE is set when a zero is detected where a stop bit was expected. Clear the FE flag by
reading SCSR and then reading SCDR.
0 = Stop bit detected
1 = Zero detected
Bit 0 — Not implemented
Always reads zero
7.6.5 Baud Rate Register
Use this register to select different baud rates for the SCI system. The SCP[1:0] bits
select the prescaler rate for the SCR[2:0] bits. Together, these five bits provide multi-
ple baud rate combinations for a given crystal frequency. Normally, this register is writ-
ten once during initialization. The prescaler is set to its fastest rate by default out of
reset, and can be changed at any time. Refer to Table 7-1 and Table 7-2 for normal
baud rate selections.
TCLR — Clear Baud Rate Counters (Test)
SCP[1:0] — SCI Baud Rate Prescaler Selects
Refer to the SCI baud rate generator block diagram.
BAUD — Baud Rate
$102B
Bit 7
654321
Bit 0
TCLR
SCP1
SCP0
RCKB
SCR2
SCR1
SCR0
RESET:
00000
U
Table 7-1 Baud Rate Prescaler Selection
Prescaler
Divide Internal
Crystal Frequency (MHz)
SCP1
SCP0
Clock By
4.0
4.9152
8.0
12.0
16.0
20.0
0
1
62500
76800
125000
187500
25000
312500
0
1
3
20833
25600
41667
62500
83332
104165
1
0
4
15625
19200
31250
46875
62500
78125
1
13
4800
5907
9600
14423
19200
24000
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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