MC68340AG16VE Freescale Semiconductor, MC68340AG16VE Datasheet - Page 305

• Manufacturer Part Number: MC68340AG16VE
• Description: IC MPU 32BIT 16MHZ 144-LQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68340AG16VE

• Processor Type: M683xx 32-Bit
• Speed: 16MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Controller Family/series: 68K
• Core Size: 32 Bit
• No. Of I/o's: 16
• Cpu Speed: 16MHz
• No. Of Timers: 2
• Embedded Interface Type: UART
• Digital Ic Case Style: LQFP
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

7.3.2.1 TRANSMITTER. The transmitters are enabled through their respective command
registers (CR) located within the serial module. The serial module signals the CPU32
when it is ready to accept a character by setting the transmitter-ready bit (TxRDY) in the
channel's status register (SR). Functional timing information for the transmitter is shown in
Figure 7-5.
The transmitter converts parallel data from the CPU32 to a serial bit stream on TxDx. It
automatically sends a start bit followed by the programmed number of data bits, an
optional parity bit, and the programmed number of stop bits. The least significant bit is
sent first. Data is shifted from the transmitter output on the falling edge of the clock
source.
Following transmission of the stop bits, if a new character is not available in the transmitter
holding register, the TxDx output remains high ('mark' condition), and the transmitter
empty bit (TxEMP) in the SR is set. Transmission resumes and the TxEMP bit is cleared
when the CPU32 loads a new character into the transmitter buffer (TB). If a disable
command is sent to the transmitter, it continues operating until the character in the
7-10
TRANSMITTER
NOTES:
1. TIMING SHOWN FOR MR2(4) = 1
2. TIMING SHOWN FOR MR2(5) = 1
3. C = TRANSMIT CHARACTER
4. W = WRITE
ENABLED
TxRDY
RTS 2
N
(SR2)
CTS
TxDx
CS
1
C1
W
MANUALLY ASSERTED
BY BIT- SET COMMAND
Figure 7-5. Transmitter Timing Diagram
Freescale Semiconductor, Inc.
TRANSMISSION
For More Information On This Product,
C1
C2
W
C1 IN
MC68340 USER’S MANUAL
Go to: www.freescale.com
C2
C3
W
START
BREAK
W
C3
C4
W
BREAK
BREAK
STOP
W
TRANSMITTED
C4
NOT
W
C5
MOTOROLA
W
C6
MANUALLY
ASSERTED
C6