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ST16C1450CJ28 Fiches technique(PDF) 7 Page - Exar Corporation |
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ST16C1450CJ28 Fiches technique(HTML) 7 Page - Exar Corporation |
7 / 32 page áç áç áç áç ST16C1450/51 REV. 4.2.0 2.97V TO 5.5V UART 7 Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain. 1.0 PRODUCT DESCRIPTION The ST16C145X provides serial asynchronous receive data synchronization, parallel-to-serial and serial-to- parallel data conversions for both the transmitter and receiver sections. These functions are necessary for converting the serial data stream into parallel data that is required in digital data systems. Synchronization for the serial data stream is accomplished by adding start and stops bits to the transmit data to form a data character (character orientated protocol). Data integrity is ensured by attaching a parity bit to the data character. The parity bit is checked by the receiver for any transmission bit errors. The 145X is capable of operation up to 1.5 Mbps with a 24 MHz crystal or external clock input with a 16X sampling clock (at VCC = 5.0V). With a crystal of 14.7456 MHz and through a software option, the user can select data rates up to 921.6 Kbps. 2.0 FUNCTIONAL DESCRIPTIONS 2.1 Internal Registers The 145X has a set of enhanced registers for controlling, monitoring and data loading and unloading. These registers function as data holding registers (THR/RHR), interrupt status and control registers (ISR/IER), a FIFO control register (FCR), receive line status and control registers (LSR/LCR), modem status and control registers (MSR/MCR), programmable data rate (clock) divisor registers (DLL/DLM), and a user accessible scractchpad register (SPR). All the register functions are discussed in full detail later in “Section 3.0, UART INTERNAL REGISTERS” on page 13. GND 15 14 15 14 19 Pwr Power supply common ground. N.C. -- -- 1, 2, 10-14, 18, 24-26, 29, 35-38, 42, 44, 48 - Not connected. NAME 28-PIN PDIP (1450) 28-PIN PDIP (1451) 28-PIN PLCC (1450) 28-PIN PLCC (1451) 48-PIN TQFP (145X) TYPE DESCRIPTION |
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