参数资料
型号: MCC68HC711D3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, UUC
封装: DIE
文件页数: 140/157页
文件大小: 2252K
代理商: MCC68HC711D3
Serial Communications Interface (SCI)
Status Flags and Interrupts
MC68HC711D3 — Rev. 2
Data Sheet
MOTOROLA
Serial Communications Interface (SCI)
83
Figure 6-8. SCI Baud Rate Diagram
6.8 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.
÷3
÷4
÷13
OSCILLATOR
AND
CLOCK GENERATOR
(÷ 4)
XTAL
EXTAL
E
AS
INTERNAL BUS CLOCK (PH2)
1:1
SCP1 AND SCP0
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)
SCR2–SCR0
SCI
TRANSMIT
BAUD RATE
(1X)
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