20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 142

• Manufacturer Part Number: 20-668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0011

• Processor Type: Rabbit 3000 8-Bit
• Speed: 55.5MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 55.5 MHz
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 55 C
• Number Of Programmable I/os: 56
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 316-1061

132
Bit(s)
1:0
7
6
5
4
3
2
Serial Port x Status Register
(Clocked Serial Mode Only)
Value
00
0
1
0
0
1
0
0
1
0
1
The receive data register is empty
There is a byte in the receive buffer. The serial port will request an interrupt
while this bit is set. The interrupt is cleared when the receive buffer is empty.
This bit is always zero in the clocked serial mode.
The receive buffer was not overrun.
The receive buffer was overrun. This bit is cleared by reading the receive buffer.
This bit is always zero in the clocked serial mode.
The transmit buffer is empty.
The transmit buffer is not empty. The serial port will request an interrupt when
the transmitter takes a byte from the transmit buffer. Transmit interrupts are
cleared when the transmit buffer is written, or any value (which will be ignored)
is written to this register.
The transmitter is idle.
The transmitter is sending a byte. An interrupt is generated when the transmitter
clears this bit, which occurs only if the transmitter is ready to start sending
another byte and the transmit buffer is empty.
These bits are always zero in the clocked serial mode.
(SASR)
(SBSR)
(SCSR)
(SDSR)
Description
Rabbit 3000 Microprocessor User’s Manual
(Address = 0x00C3)
(Address = 0x00D3)
(Address = 0x00E3)
(Address = 0x00F3)