參數(shù)資料
型號： 101-1156
廠商： Rabbit Semiconductor
文件頁數(shù)： 72/134頁
文件大小： 0K
描述： KIT DEVELOPMENT INT'L RCM4200
標(biāo)準(zhǔn)包裝： 1
系列： RabbitCore 4000
類型： MPU 模塊
適用于相關(guān)產(chǎn)品： RCM4200
所含物品： RabbitCore 模塊、開發(fā)板、交流適配器、纜線和 Dynamic C? 光盤
36
RabbitCore RCM4200
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 RCM4200 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\RCM4200\SERIAL folder.
Table 3. Rabbit 4000 Serial Port and Clock Pins
Serial Port A
(program-
ming port)
TXA
PC6, PC7, PD6
Serial Port D
TXD
PC0, PC1
RXA
PC7, PD7, PE7
RXD
PC1, PD1, PE1
SCLKA
PB1
SCLKD
PD0, PE0, PE3, PC3
Serial Port B
(used by A/D
converter on
RCM4200)
TXB
PC4, PC5, PD4
Serial Port E
(RCM4210
only)
TXE
PD6, PC6, PE6
RXB
PC5, PD5, PE5
RXE
PD7, PC7, PE7
SCLKB
PB0
RCLKE
PD5, PC5, PE5
Serial Port C
(shared by
serial flash)
TXC
PC2, PC3
TCLKE
PD4, PC4, PE4
RXC
PC3, PD3, PE3
RCLKE must be selected to be on the same parallel
port as TXE.
SCLKC
PD2, PE2, PE7, PC7
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