SC68C752BIB48.128 NXP Semiconductors, SC68C752BIB48.128 Datasheet - Page 14

• Manufacturer Part Number: SC68C752BIB48.128
• Manufacturer: NXP Semiconductors

Specifications of SC68C752BIB48.128

• Transmit Fifo: 64Byte
• Receive Fifo: 64Byte
• Transmitter And Receiver Fifo Counter: Yes
• Data Rate: 5Mbps
• Package Type: LQFP
• Operating Supply Voltage (max): 5.5V
• Mounting: Surface Mount
• Pin Count: 48
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Number Of Channels: 2
• Lead Free Status / RoHS Status: Compliant

NXP Semiconductors
SC68C752B_4
Product data sheet
6.5.1 Interrupt mode operation
6.5.2 Polled mode operation
In Interrupt mode (if any bit of IER[3:0] is 1) the processor is informed of the status of the
receiver and transmitter by an interrupt signal, IRQ. Therefore, it is not necessary to
continuously poll the Line Status Register (LSR) to see if any interrupt needs to be
serviced.
In Polled mode (IER[3:0] = 0000) the status of the receiver and transmitter can be
checked by polling the Line Status Register (LSR). This mode is an alternative to the FIFO
Interrupt mode of operation where the status of the receiver and transmitter is
automatically known by means of interrupts sent to the CPU.
polled mode operation.
Fig 8.
Fig 9.
Interrupt mode operation
FIFO polled mode operation
Figure 8
PROCESSOR
PROCESSOR
shows Interrupt mode operation.
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
Rev. 04 — 20 January 2010
R/W
R/W
IRQ
THR
THR
IER
IER
IIR
IIR
Figure 9
1
0
SC68C752B
1
0
RHR
RHR
1
002aab096
0
002aab097
shows FIFO
1
0
© NXP B.V. 2010. All rights reserved.
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