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ST16C2550CQ48 Arkusz danych(PDF) 8 Page - Exar Corporation |
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ST16C2550CQ48 Arkusz danych(HTML) 8 Page - Exar Corporation |
8 / 39 page ST16C2550 xr 2.97V TO 5.5V DUART WITH 16-BYTE FIFO REV. 4.4.0 8 2.0 FUNCTIONAL DESCRIPTIONS 2.1 CPU Interface The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and write transactions. The C2550 data interface supports the Intel compatible types of CPUs and it is compatible to the industry standard 16C550 UART. No clock (oscillator nor external clock) is required to operate a data bus transaction. Each bus cycle is asynchronous using CS#, IOR# and IOW# signals. Both UART channels share the same data bus for host operations. The data bus interconnections are shown in Figure 3. . 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 11). 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. FIGURE 3. ST16C2550 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 RXRDYA# TXRDYA# RXRDYA# TXRDYA# RXRDYB# TXRDYB# RXRDYB# TXRDYB# UART_RESET RESET Serial Interface of RS-232, RS-485 Serial Interface of RS- 232, RS-485 2750int |
Podobny numer części - ST16C2550CQ48 |
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Podobny opis - ST16C2550CQ48 |
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