參數(shù)資料
型號： MAX3110ECNI+G36
廠商： Maxim Integrated Products
文件頁數(shù)： 21/31頁
文件大?。?/td> 0K
描述： IC TXRX RS232 SPI W/CAP 28-DIP
產(chǎn)品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 14
特點： 收發(fā)器
通道數(shù)： 1，UART
規(guī)程： RS232，RS485
電源電壓： 4.5 V ~ 5.5 V
帶IrDA 編碼器/解碼器： 是
帶故障啟動位檢測功能： 是
帶CMOS： 是
安裝類型： 通孔
封裝/外殼： 28-DIP（0.300"，7.62mm）
供應商設備封裝： 28-PDIP
包裝： 管件
產(chǎn)品目錄頁面： 1404 (CN2011-ZH PDF)
SPI/MICROWIRE-Compatible UART and ±15kV ESD-
Protected RS-232 Transceivers with Internal Capacitors
This is a C-language outline of an interrupt-driven software driver that interfaces
to a MAX3110E/MAX3111E, providing an intermediate layer between the bit-manipulation
subroutine and the familiar PutChar / GetChar subroutines.
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.
char is an 8 bit character.
int is a 16 bit unsigned integer.
& is the bitwise Boolean AND operator.
| is the bitwise Boolean OR operator.
/* High level interface routine to put a character to the MAX3110E/MAX3111E. */
PutChar ( char c )
{
EnQueue ( txqueue, c );
/* enable the transmit-buffer-empty interrupt */
config = config | 0x0800; /* set the TM bit */
config = config | 0xC000; /* set bits 15 and 14 */
MAX3110E/MAX3111E ( config );
}
/* High level interface routine to get a character from the MAX3110E/MAX3111E.
** Wait for a character to be received, if necessary.
*/
char GetChar ( )
{
while ( IsQueueEmpty ( rxqueue ) )
/* wait for data to be received */ ;
return DeQueue ( rxqueue );
}
/* Configure the MAX3110E/MAX3111E with the specified baud rate.
*/
ConfigureMAX3110E/MAX3111E ( int baud_rate_index )
{
baud_rate_index = baud_rate_index & 0x000F; /* restrict to a 4 bit field */
config = 0xC400 + baud_rate_index; /* enable received data interrupt */
MAX3110E/MAX3111E ( config );
}
/* private variable that stores the configuration settings for the MAX3110E/MAX3111E
*/
int config;
/* Low level communication routine between the computer and the MAX3110E/MAX3111E.
** This is a PRIVATE routine to be used only within the driver software.
*/
int MAX3110E/MAX3111E ( int mosi )
{
int miso;
/* this is interface-specific.
** Transmit 16 bits of master-out, slave-in data, MSB first,
** while simultaneously receiving 16 bits of master-in, slave-out data.
** If and SPI hardware interface is available, use (CPOL=0,CPHA=0) mode.
** Lacking specialized hardware, just set and clear I/O bits to generate
** the waveform in figures 2 and 3 in the MAX3110E/MAX311E data sheet.
*/
return miso; /* return 16 bits of master-in, slave-out data, MSB first */
}
Listing 1. Outline for a MAX3110E/MAX3111E Software Driver
28
Maxim Integrated
MAX3110E/MAX3111E
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