MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 174

• 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: -

9.4.1.2 Status Register
9.4.1.3 Data Register
9.4.2 SCI Pins
9.4.3 SCI Operation
9-24
MOTOROLA
SCSR contains flags that show SCI operating conditions. These flags are cleared ei-
ther by SCI hardware or by reading SCSR, then reading or writing SCDR. A long-word
read can consecutively access both SCSR and SCDR. This action clears receiver sta-
tus flag bits that were set at the time of the read, but does not clear TDRE or TC flags.
If an internal SCI signal for setting a status bit comes after reading the asserted status
bits, but before reading or writing SCDR, the newly set status bit is not cleared. SCSR
must be read again with the bit set, and SCDR must be read or written before the sta-
tus bit is cleared.
Reading either byte of SCSR causes all 16 bits to be accessed, and any status bit al-
ready set in either byte is cleared on a subsequent read or write of SCDR.
SCDR contains two data registers at the same address. The receive data register
(RDR) is a read-only register that contains data received by the SCI serial interface.
Data enters the receive serial shifter and is transferred to RDR. The transmit data reg-
ister (TDR) is a write-only register that contains data to be transmitted. Data is first writ-
ten to TDR, then transferred to the transmit serial shifter, where additional format bits
are added before transmission. R[7:0]/T[7:0] contain either the first eight data bits re-
ceived when SCDR is read, or the first eight data bits to be transmitted when SCDR is
written. R8/T8 are used when the SCI is configured for 9-bit operation. When it is con-
figured for 8-bit operation, they have no meaning or effect.
Two unidirectional pins, TXD (transmit data) and RXD (receive data), are associated
with the SCI. TXD can be used by the SCI or for general-purpose I/O. Function is as-
signed by the port QS pin assignment register (PQSPAR). The receive data (RXD) pin
is dedicated to the SCI. Table 9-4 shows SCI pin function.
SCI operation can be polled by means of status flags in SCSR, or interrupt-driven
operation can be employed by the interrupt enable bits in SCCR1.
Transmit Data
Receive Data
Pin Names
Mnemonics
RXD
TXD
QUEUED SERIAL MODULE
Table 9-4 SCI Pins
Transmitter disabled
Transmitter enabled
Receiver disabled
Receiver enabled
Mode
Serial data output from SCI
Serial data input to SCI
General-purpose I/O
Function
Not used
USER’S MANUAL
MC68336/376