668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 131

• Manufacturer Part Number: 668-0003-C
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 668-0003-C

• Rohs Status: RoHS non-compliant
• Processor Type: Rabbit 2000 8-Bit
• Speed: 30MHz
• Voltage: 2.7V, 3V, 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 100-MQFP, 100-PQFP
• Features: -
• Other names: 316-1004; 668-0003

12.5 Clocked Serial Ports
See Section B.2.3 for more information for more information about a new feature added to
revisions A–C to better support full-duplex communication.
Ports A and B can operate in clocked mode. The data line and clock line are driven as
shown in Figure 12-4. The data and clock are provided as 8-bit bursts. The transmit shift
register advances on the falling edge of the clock. The receiver samples the data on the ris-
ing edge of the clock. The serial port can generate the clock or the clock can be provided
externally.
Chapter 12 Rabbit Serial Ports
start bit
Bit 0
8 clocks
sampling
point
Figure 12-4. Serial Port Synchronization
Asynchronous Receive
Synchronous Receive/Transmit
Asynchronous Transmit
(Transmit clock is input clock/2)
Input Clock
Serial Port
Transmitter Data Reg Full
Receiver Data
Ready Bit
Bit 7
stop bit
SCLK
125