MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 175

• Manufacturer Part Number: MC68376BGMAB20
• Description: IC MCU 32BIT 8K ROM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68376BGMAB20

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CAN, EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Ram Size: 7.5K x 8
• Voltage - Supply (vcc/vdd): 4.75 V ~ 5.25 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 160-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

9.4.3.1 Definition of Terms
9.4.3.2 Serial Formats
9.4.3.3 Baud Clock
MC68336/376
USER’S MANUAL
All data frames must have a start bit and at least one stop bit. Receiving and transmit-
ting devices must use the same data frame format. The SCI provides hardware sup-
port for both 10-bit and 11-bit frames. The M bit in SCCR1 specifies the number of bits
per frame.
The most common data frame format for NRZ serial interfaces is one start bit, eight
data bits (LSB first), and one stop bit; a total of ten bits. The most common 11-bit data
frame contains one start bit, eight data bits, a parity or control bit, and one stop bit.
Ten-bit and eleven-bit frames are shown in Table 9-5.
The SCI baud rate is programmed by writing a 13-bit value to the SCBR field in SCI
control register zero (SCCR0). The baud rate is derived from the MCU system clock
by a modulus counter. Writing a value of zero to SCBR[12:0] disables the baud rate
generator. Baud rate is calculated as follows:
• Bit-Time — The time required to transmit or receive one bit of data, which is equal
• Start Bit — One bit-time of logic zero that indicates the beginning of a data frame.
• Stop Bit— One bit-time of logic one that indicates the end of a data frame.
• Frame — A complete unit of serial information. The SCI can use 10-bit or 11-bit
• Data Frame — A start bit, a specified number of data or information bits, and at
• Idle Frame — A frame that consists of consecutive ones. An idle frame has no
• Break Frame — A frame that consists of consecutive zeros. A break frame has
to one cycle of the baud frequency.
A start bit must begin with a one-to-zero transition and be preceded by at least
three receive time samples of logic one.
frames.
least one stop bit.
start bit.
no stop bits.
Start
Start
1
1
1
1
1
Table 9-5 Serial Frame Formats
QUEUED SERIAL MODULE
Data
Data
7
7
8
7
8
10-Bit Frames
11-Bit Frames
Parity/Control
Parity/Control
—
—
1
1
1
Stop
Stop
2
1
1
2
1
MOTOROLA
9-25