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ST16C2450 数据表(PDF) 6 Page - Exar Corporation |
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ST16C2450 数据表(HTML) 6 Page - Exar Corporation |
6 / 30 page ST16C2450 xr 2.97V TO 5.5V DUART REV. 4.0.1 6 . 2.2 Device Reset The RESET input resets the internal registers and the serial interface outputs in both channels to their default state (see Table 8). An active high pulse of at least 40 ns duration will be required to activate the reset function in the device. 2.3 Channel A and B Selection The UART provides the user with the capability to bi-directionally transfer information between an external CPU and an external serial communication device. A logic 0 on chip select pins, CSA# or CSB#, allows the user to select UART channel A or B to configure, send transmit data and/or unload receive data to/from the UART. Selecting both UARTs can be useful during power up initialization to write to the same internal registers, but do not attempt to read from both uarts simultaneously. Individual channel select functions are shown in Table 1. 2.4 Channel A and B Internal Registers Each UART channel in the 2450 has a standard register set for controlling, monitoring and data loading and unloading. These registers function as data holding registers (THR/RHR), interrupt status and control registers (ISR/IER), 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 scratch pad register (SPR). FIGURE 3. ST16C2450 DATA BUS INTERCONNECTIONS TABLE 1: CHANNEL A AND B SELECT CSA# CSB# FUNCTION 1 1 UART de-selected 0 1 Channel A selected 1 0 Channel B selected 0 0 Channel A and B selected VCC VCC OP2A# DSRA# CTSA# RTSA# DTRA# RXA TXA RIA# CDA# OP2B# DSRB# CTSB# RTSB# DTRB# RXB TXB RIB# CDB# GND A0 A1 A2 UART_CSA# UART_CSB# IOR# IOW# D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 A2 CSA# CSB# D0 D1 D2 D3 D4 D5 D6 D7 IOR# IOW# UART Channel A UART Channel B UART_INTB UART_INTA INTB INTA UART_RESET RESET RS-232 Serial Interface RS-232 Serial Interface |
类似零件编号 - ST16C2450 |
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类似说明 - ST16C2450 |
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