MAX3140 Maxim, MAX3140 Datasheet - Page 32

• Manufacturer Part Number: MAX3140
• Description: SPI/MICROWIRE-Compatible UART with Integrated True Fail-Safe RS-485/RS-422 Transceivers
• Manufacturer: Maxim

SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
Listing 1 is a C-language outline of an interrupt-driven
software driver that interfaces to a MAX3140, providing
an intermediate layer between the bit-manipulation sub-
routine and the familiar PutChar/GetChar subroutines.
Listing 1. Outline for a MAX3140 Software Driver
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Software Driver
The user must supply code for managing the transmit
and receive queues, as well as the low-level hardware
interface itself. The interrupt control hardware must be
initialized before this driver is called.