668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 214

• 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

Synchronous Serial Port
To initiate basic sending or receiving in the clocked serial mode, a command must be
issued by writing to bits (7,6) of the control register for each byte sent or received. There
is one command is to send a byte, and a different command to receive a byte. For full-
duplex communication, it is necessary that a Tx command be issued first, followed within
one-half bit time by the Rx command. The new feature added to revisions A–C contains a
command that initiates a transmit and receive at the same time for better support of full-
duplex communication.
208
7:6
5:4
3:2
1:0
Bit(s)
Serial Port x Control Register
00
01
10
11
00
01
1x
00
01
10
11
00
01
10
Value
Table B-8. Serial Port Control Register Ports A and B
No operation. These bits are ignored in the asynch mode.
In clocked serial mode, start a byte receive operation.
In clocked serial mode, start a byte transmit operation.
In clocked serial mode, start a byte transmit operation and a byte receive
operation simultaneously.
Only available in revisions A–C
Parallel Port C is used for input.
Parallel Port D is used for input.
Disable the receiver input.
Asynch mode with 8 bits per character.
Asynch mode with 7 bits per character. In this mode the most significant bit of a
byte is ignored for transmit, and is always zero in receive data.
Clocked serial mode with external clock.
Serial Port A clock is on Parallel Port PB1
Serial Port B clock is on Parallel Port PB0
Clocked serial mode with internal clock.
Serial Port A clock is on Parallel Port PB1
Serial Port B clock is on Parallel Port PB0
The Serial Port interrupt is disabled.
The Serial Port uses Interrupt Priority 1.
The Serial Port uses Interrupt Priority 2.
(SACR)
(SBCR)
Description
Rabbit 2000 Microprocessor User’s Manual
(Address = 0xD4)
(Address = 0xC4)