MC68HC711xxxx Motorola, MC68HC711xxxx Datasheet - Page 129
MC68HC711xxxx
Manufacturer Part Number
MC68HC711xxxx
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC68HC711XXXX.pdf
(268 pages)
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7.8 Status Flags and Interrupts
M68HC11E Family — Rev. 5
MOTOROLA
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
*SCP2 is present only on MC68HC(7)11E20.
XTAL
EXTAL
Serial Communications Interface (SCI)
CLOCK GENERATOR
OSCILLATOR
Figure 7-9. MC68HC(7)11E20 SCI Baud Rate
AND
(÷4)
Generator Block Diagram
AS
E
÷
÷
÷
÷
÷
÷
÷
2
2
2
2
2
2
2
0:0:0
SCR[2:0]
÷
0:0:0
0:0:1
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
3
Serial Communications Interface (SCI)
0:0:1
INTERNAL BUS CLOCK (PH2)
÷
4
0:1:0
Status Flags and Interrupts
÷
BAUD RATE
BAUD RATE
TRANSMIT
RECEIVE
13
(16X)
÷
(1X)
SCI
SCI
0:1:1
16
÷
39
Data Sheet
SCP[2:0]*
1:0:0
129
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