S9S12GN16F0VLF Freescale Semiconductor, S9S12GN16F0VLF Datasheet - Page 690
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S9S12GN16F0VLF
Manufacturer Part Number
S9S12GN16F0VLF
Description
16-bit Microcontrollers - MCU 16-bit16k Flash 2k RAM
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S12G96F0CLL.pdf
(1292 pages)
Specifications of S9S12GN16F0VLF
Rohs
yes
Core
S12
Processor Series
MC9S12G
Data Bus Width
16 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
16 KB
Data Ram Size
1024 B
On-chip Adc
Yes
Operating Supply Voltage
3.13 V to 5.5 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
TSSOP-20
Mounting Style
SMD/SMT
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Serial Communication Interface (S12SCIV5)
indicating that the received byte can be read. If the receive interrupt enable bit, RIE, in SCI control
register 2 (SCICR2) is also set, the RDRF flag generates an RDRF interrupt request.
20.4.6.3
The RT clock rate. The RT clock is an internal signal with a frequency 16 times the baud rate. To adjust
for baud rate mismatch, the RT clock (see
To locate the start bit, data recovery logic does an asynchronous search for a logic 0 preceded by three logic
1s.When the falling edge of a possible start bit occurs, the RT clock begins to count to 16.
To verify the start bit and to detect noise, data recovery logic takes samples at RT3, RT5, and RT7.
Figure 20-17
If start bit verification is not successful, the RT clock is reset and a new search for a start bit begins.
692
RT CLock Count
•
•
Reset RT Clock
After every start bit
After the receiver detects a data bit change from logic 1 to logic 0 (after the majority of data bit
samples at RT8, RT9, and RT10 returns a valid logic 1 and the majority of the next RT8, RT9, and
RT10 samples returns a valid logic 0)
RT Clock
Samples
RXD
Data Sampling
summarizes the results of the start bit verification samples.
1
RT3, RT5, and RT7 Samples
1
1
1
000
001
010
011
100
101
110
111
1
MC9S12G Family Reference Manual,
1
Figure 20-21. Receiver Data Sampling
Qualification
Start Bit
Table 20-17. Start Bit Verification
1
1
Figure
0
0
20-21) is re-synchronized:
Start Bit Verification
Verification
Start Bit
0
Yes
Yes
Yes
Yes
No
No
No
No
0
Start Bit
0
Sampling
Data
Rev.1.23
0
0
Noise Flag
0
1
1
0
1
0
0
0
Freescale Semiconductor
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