参数资料
型号: 20-101-1094
厂商: Rabbit Semiconductor
文件页数: 67/130页
文件大小: 0K
描述: MCU RCM4000 RABBITCORE
标准包装: 1
系列: RabbitCore®
模块/板类型: MPU 核心模块
适用于相关产品: RCM4000
产品目录页面: 619 (CN2011-ZH PDF)
其它名称: 316-1139
User’s Manual
35
Table 3 summarizes the possible parallel port pins for the serial ports and their clocks.
4.2.1.1 Using the Serial Ports
The receive lines on the RCM4000 serial ports do not have pull-up resistors. If you are
using the serial ports without a receiver chip (for example, for RS-422, RS-232, or RS-485
serial communication), the absence of a pull-up resistor on the receive line will likely lead
to line breaks being generated since line breaks are normally generated whenever the
receive line is pulled low. If you are operating a serial port asynchronously, you can inhibit
character assembly during breaks by setting bit 1 in the corresponding Serial Port
Extended Register to 1. Should you need line breaks, you will have to either add a pull-up
resistor on your motherboard or use a receiver that incorporates the circuits to have the
output default to the nonbreak levels.
The Dynamic C RS232.LIB library requires you to define the macro RS232_
NOCHARASSYINBRK
to inhibit break-character assembly for all the serial ports.
#define RS232_NOCHARASSYINBRK
This macro is already defined so that it is the default behavior for the sample programs in
the Dynamic C SAMPLES\RCM4000\SERIAL folder.
Table 3. Rabbit 4000 Serial Port and Clock Pins
Serial Port A
TXA
PC6, PC7
Serial Port D
TXD
PC0, PC1
RXA
PC7, PE7
RXD
PC1, PE1
SCLKA
PB1
SCLKD
PE0, PE3, PC3
Serial Port B
(RCM4010
only)
TXB
PC4, PC5
Serial Port F
TXF
PE2, PC2
RXB
PC5, PE5
RXF
PE3, PC3
SCLKB
PB0
RCLKF
PE1, PC1
Serial Port C
TXC
PC2, PC3
TCLKF
PE0, PC0
RXC
PC3, PE3
SCLKC
PE2, PE7, PC7
RCLKF must be selected to be on the same parallel port as TXF.
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