MC68HC711KS2MFN4 Freescale Semiconductor, MC68HC711KS2MFN4 Datasheet - Page 150

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MC68HC711KS2MFN4

Manufacturer Part Number
MC68HC711KS2MFN4
Description
32K EPROM - SLOW MODE
Manufacturer
Freescale Semiconductor
Datasheet

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Serial Communications Interface (SCI)
7.3 Data Format
Technical Data
150
START
START
BIT
BIT
BIT 0
BIT 0
BIT 1
BIT 1
The M68HC11K series offers several enhancements to the basic
MC68HC11 SCI, including:
The SCI uses the standard non-return to zero mark/space data format
illustrated in
Data is transmitted in frames consisting of a start bit, a word of eight or
nine data bits, and a stop bit. The step-by-step transmission procedure
is:
1. The transmission line is idle before a message is transmitted. This
2. A start bit, logic 0, is transmitted, indicating the start of a frame.
3. An 8-bit or 9-bit word is transmitted, least significant bit (LSB) first.
4. A stop bit, logic 1, is transmitted to indicate the end of a frame.
5. An optional number of breaks can be transmitted. A break is the
BIT 2
BIT 2
13-bit modulus prescaler in the baud generator
Receiver-active flag
Transmitter and receiver hardware parity
Accelerated idle line detection
means that the line is in a logic 1 state for at least one frame time.
transmission of a logic low state for one frame time. After the last
break character is sent, the line goes high for at least one bit time.
Serial Communications Interface (SCI)
Figure 7-1. SCI Data Formats
BIT 3
BIT 3
9-BIT DATA FORMAT
(BIT MIN SCC1 CLEAR)
(BIT MIN SCC1 SET)
8-BIT DATA FORMAT
Figure
BIT 4
BIT 4
7-1.
BIT 5
BIT5
BIT 6
BIT6
BIT 7
BIT7
OR DATA
PARITY
STOP
BIT
BIT 8
BIT
START
NEXT
STOP
BIT
BIT
START
NEXT
M68HC11K Family
BIT
MOTOROLA

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