XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 256
XC908AS60ACFU
Manufacturer Part Number
XC908AS60ACFU
Description
MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
Manufacturer
Motorola Semiconductor Products
Datasheet
1.XC908AS60ACFU.pdf
(576 pages)
- Current page: 256 of 576
- Download datasheet (4Mb)
Serial Communications Interface (SCI)
18.5.3.1 Character Length
18.5.3.2 Character Reception
18.5.3.3 Data Sampling
Technical Data
256
The receiver can accommodate either 8-bit or 9-bit data. The state of the
M bit in SCI control register 1 (SCC1) determines character length.
When receiving 9-bit data, bit R8 in SCI control register 2 (SCC2) is the
ninth bit (bit 8). When receiving 8-bit data, bit R8 is a copy of the eighth
bit (bit 7).
During an SCI reception, the receive shift register shifts characters in
from the RxD pin. The SCI data register (SCDR) is the read-only buffer
between the internal data bus and the receive shift register.
After a complete character shifts into the receive shift register, the data
portion of the character transfers to the SCDR. The SCI receiver full bit,
SCRF, in SCI status register 1 (SCS1) becomes set, indicating that the
received byte can be read. If the SCI receive interrupt enable bit, SCRIE,
in SCC2 is also set, the SCRF bit generates a receiver CPU interrupt
request.
The receiver samples the RxD pin at 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 is resynchronized at the following
times (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.
•
•
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)
Serial Communications Interface (SCI)
Figure
18-8):
MC68HC908AZ60A — Rev 2.0
MOTOROLA
Related parts for XC908AS60ACFU
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Triacs
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
Triacs
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
6367254 Motorola SC (xstrs/r F)
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
50 Amperes NPN Silicon Power Darlington Transistor 850 Volts 250 Watts
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
M68HC12B Family Data Sheet
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
DUAL GATE Mosfet VHF Amplifier
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
DUAL GATE Mosfet VHF Amplifier
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
NPN Darlington Silicon Power Transistor 10 Amperes 80 Volts 20 Watts
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
Integrated Circuits
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
Low Skew CMOS Clock Driver
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
Low Skew CMOS Clock Driver With Reset
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
Low-cost 16-bit DSP with DDR Controller and 10/100 Mbps Ethernet MAC
Manufacturer:
Motorola Semiconductor Products
Datasheet:
Part Number:
Description:
Fast Recovery Power Rectifiers
Manufacturer:
Motorola Semiconductor Products
Datasheet: