PC16552C

The PC16552C is a kind of dual version of the NS16550AF universal asynchronous receiver/transmitter (UART). The two serial channels are completely independent except for a common CPU interface and crystal input. Each channel can operate with on-chip transmitter and receiver FIFOs (FIFO mode) to relieve the CPU of excessive software overhead.

There are some features ofPC16552C as follows: (1)dual independent UARTs; (2)capable of running all existing NS16450 and NS16550AF software; (3)after reset, all registers are identical to the 16450 register set; (4)read and write cycle times of 84 ns; (5)in the FIFO mode transmitter and receiver are each buffered with 16-byte FIFOs to reduce the number of interrupts presented to the CPU; (6)holding and shift registers in the NS16450 mode eliminate the need for precision synchronization between the CPU and serial data; (7)independently controlled transmit, receive, line status and data set interrupts; (8)MODEM control functions (CTS, RTS, DSR, DTR, RI and DCD); (9)false start bit detection; (10)complete status reporting capabilities; (11)line break generation and detection; (12)full prioritized interrupt system controls.

The following of PC16552C is about the maximum ratings: (1)temperature under bias: 0 to 70; (2)storage temperature: -65 to +150; (3)all input or output voltages with respect to VSS: -0.5 to +7.0 V; (4)power dissipation: 1 W.