參數(shù)資料
型號： 20-101-1154
廠商： Rabbit Semiconductor
文件頁數(shù)： 45/112頁
文件大?。?/td> 0K
描述： MODULE RCM4120 RABBITCORE
標(biāo)準(zhǔn)包裝： 1
系列： RabbitCore®
模塊/板類型： MPU 核心模塊
適用于相關(guān)產(chǎn)品： RCM4120
其它名稱： 316-1122
34
RabbitCore RCM4100
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 RCM4100 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\RCM4100\SERIAL folder.
Table 3. Rabbit 4000 Serial Port and Clock Pins
Serial Port A
TXA
PC6, PC7, PD6
Serial Port E
TXE
PD6, PE6, PC6
RXA
PC7, PD7, PE7
RXE
PD7, PE7, PC7
SCLKA
PB1
RCLKE
PD5, PE5, PC5
Serial Port B
TXB
PC4, PC5, PD4
TCLKE
PD4, PE4, PC4
RXB
PC5, PD5, PE5
Serial Port F
TXF
PD2, PE2, PC2
SCLKB
PB0
RXF
PD3, PE3, PC3
Serial Port C
TXC
PC2, PC3
RCLKF
PD1, PE1, PC1
RXC
PC3, PD3, PE3
TCLKF
PD0, PE0, PC0
SCLKC
PD2, PE2, PE7, PC7
RCLKE and RCLKF must be selected to be on the
same parallel port as TXE and TXF respectively.
Serial Port D
TXD
PC0, PC1
RXD
PC1, PD1, PE1
SCLKD
PD0, PE0, PE3, PC3
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