Download PDF by William H. Payne: Embedded Controller FORTH: For the 8051 Family

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Additional resources for Embedded Controller FORTH: For the 8051 Family

Sample text

Schematic of 8250 ACE using a 1488 line driver and 1489 line receiver. -1-12 and a maximum of + 5 volts are required for the 1488 chip to work properly. 22. Silkscreen of motherboard printed circuit implementation. 18. 24 shows the ground plane film. The ground plane is located directly beneath the component side. 25. 26. This revision of the motherboard includes chip capacitor pads beneath each integrated circuit. You can see the bars under the chips. The artwork for regular chip decoupling capacitors was not removed.

Separate Code and External Data 27 - E A on the 8051 must be tied low to force the microcontroller to fetch instructions from external memory. If EA is tied high, then the 8051 fetches instructions from internal ROM (EPROM) until the address exceeds the physical memory on board the chip. - P S E N does not come out of the chip while the internal memory is accessed. 10 shows a diagram of a combined code and external memory layout emphasizing the three 8051 pins, - E A , - P S E N , and - R D , which must be correctly connected.

READLINE zeros ASCIIBUFFER. The sequence of FORTH words PRIF HANDLE ASCIIBUFFER LINESIZE sets up the arguments for a UNIX-like read from the primary file. These are handle\buf f er address\number of bytes to read READ reads the contents of the file into the buffer. It attempts to read the number of bytes specified. It may read fewer bytes. READ returns \error #\1 if an error occurred. Or it returns \number of bytes read\0 if the read was successful. , and returns to the operating system with QUIT.

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