NS9210B-0-I75 Datasheet, PDF (25/68 Pages) List of Unclassifed Manufacturers – Figure 1 shows the NS7520 modules. Dashed lines indicate shared pins

Serial controller
Serial controller
The NS7520 supports two independent universal asynchronous/synchronous receiver/transmitter
channels. Each channel supports these features:
Independent programmable bit-rate generator
UART and SPI (master) modes
High-speed data transfer:
– x1 mode: 4Mbits/sec
– x16 mode: 230 Kbits/sec
32–byte TX FIFO
32–byte RX FIFO
Programmable data format: 5–8 data bits; odd, even, or no parity; 1, 2 stop bits
Programmable channel modes: normal, local loopback, remote loopback
Control signal support
Maskable interrupt conditions:
– Receive break detection
– Receive framing error
– Receive parity error
– Receive overrun error
– Receive FIFO ready
– Receive FIFO half-full
– Transmit FIFO ready
– Transmit FIFO half-empty
– CTS, DSR, DCD, RI state change detection
Clock/data encoding: NRZ, NRZB, NRZI, FM, Manchester
Multi-drop capable
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