Maxim Integrated High-Speed Microcontroller Users Guide: Network Microcontroller Supplement - Manual (Page 210)

High-Speed Microcontroller User’s
Guide: Network Microcontroller
Supplement
210
ADDITIONAL FUNCTIONS AVAILABLE IN ROM VERSION 1.2.0
If the ROM version (as shown when entering the serial loader) is 1.2.0 or greater, the following additional ROM functions are available.
For earlier ROM versions, equivalent functionality is being made available via external C libraries, which can be found at:
http://files.maxim-ic.com/microcontroller/mxtni.
rom_netboot
The rom_netboot function initiates netboot, ignoring the state of the netboot port pin.
task_switcher
This function is the address of the default task scheduler built into the ROM, which is periodically called by the timer interrupt. The
address is exported to make replacement of the timer interrupt handler easier.
tick_calculatereload
This function calculates the reload value for the timer tick based on the CPU crystal speed. The result is saved into directs used by the
timer interrupt handler.
owm_probeclock
This function attempts to determine the processor crystal speed through 1-Wire timing measurements.
Example: If the crystal speed is 18.432MHz, the result is 1843. The result is zero if the bus is shorted, if there is no 1-Wire presence, or
an error occurred during measurement. The result is not very accurate and could be off by as much as +100% to -50%.
owm_calculatedivisor
This function calculates the initialization value for the 1-Wire master given a CPU speed.
info_sendstring
This function prints a zero-terminated string on serial port 0 using bit-bang routines.
info_sendtwohex
This functions prints a hexadecimal value on serial port 0 using bit-bang routines.
INPUT DESCRIPTION OUTPUT DESCRIPTION
ACC Value to print —
INPUT DESCRIPTION OUTPUT DESCRIPTION
DPTR0 String address in MOVC memory —
INPUT DESCRIPTION OUTPUT DESCRIPTION
R1:R0 Crystal speed (x 10kHz) ACC Divisor to use with 1-Wire master
INPUT DESCRIPTION OUTPUT DESCRIPTION
— R1:R0 Crystal speed (x 10kHz)
INPUT DESCRIPTION OUTPUT DESCRIPTION
R1:R0 Crystal speed (Function does not return a value)
INPUT DESCRIPTION OUTPUT DESCRIPTION
— (Function does not return a value)
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