20-668-0024 Rabbit Semiconductor, 20-668-0024 Datasheet - Page 149

• Manufacturer Part Number: 20-668-0024
• Description: IC CPU RABBIT4000 128-LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0024

• Processor Type: Rabbit 4000 8-bit
• Speed: 60MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: 20-668-0022; 316-1078

Chapter 16 Serial Ports A – D
Bit(s)
1:0
7
6
5
4
3
2
Serial Port x Status Register
(Asynchronous Mode Only)
Value
00
0
1
0
1
0
1
0
1
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.
The byte in the receive buffer is data, received with a valid stop bit.
The byte in the receive buffer is an address, or a byte with a framing error. If an
address bit is not expected, and the data in the buffer is all zeros, this is a break.
The receive buffer was not overrun.
The receive buffer was overrun. This bit is cleared by reading the receive buffer.
The byte in the receive buffer has no parity error (or was not checked for parity).
The byte in the receive buffer had a parity error.
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 async mode.
(SASR)
(SBSR)
(SCSR)
(SDSR)
Description
(Address = 0x00C3)
(Address = 0x00D3)
(Address = 0x00E3)
(Address = 0x00F3)
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