参数资料
型号: MC68HC11D3CFN1
厂商: ABILIS SYSTEMS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 1 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 99/124页
文件大小: 6875K
代理商: MC68HC11D3CFN1
SERIAL COMMUNICATIONS INTERFACE
7-10
TECHNICAL DATA
Figure 7-3 SCI Baud Rate Diagram
7.7 Status Flags and Interrupts
The SCI transmitter has two status flags. These status flags can be read by software
(polled) to tell when the corresponding condition exists. Alternatively, a local interrupt
enable bit can be set to enable each of these status conditions to generate interrupt
requests when the corresponding condition is present. Status flags are automatically
set by hardware logic conditions, but must be cleared by software, which provides an
interlock mechanism that enables logic to know when software has noticed the status
indication. The software clearing sequence for these flags is automatic — functions
that are normally performed in response to the status flags also satisfy the conditions
of the clearing sequence.
SCI BAUD GENERATOR
÷3
÷4
÷ 13
OSCILLATOR
AND
CLOCK GENERATOR
(÷ 4)
XTAL
EXTAL
E
AS
INTERNAL BUS CLOCK (PH2)
1:1
SCP[1:0]
1:0
0:1
0:0
÷2
0:0:0
÷2
0:0:1
÷2
0:1:0
÷2
0:1:1
÷2
1:0:0
÷2
1:0:1
÷2
1:1:0
1:1:1
÷16
SCI
RECEIVE
BAUD RATE
(16X)
SCR[2:0]
SCI
TRANSMIT
BAUD RATE
(1X)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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