IPC@CHIP Documentation - SC12 @CHIP-RTOS V1.10

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Interrupt 0xA1 service 0x8A: HAL: Get Frequencies
Parameters
AH
AL
Get the system frequencies.
Must be 0x8A.
Which frequency to get:
0 = Return processor frequency
1 = Return timer base frequency
2 = Return maximum baud rate
3 = Return PWD timer frequency
Return Value
Comments
DX:AX frequency [Hz]
Use the timer base frequency to compute the correct timer clock divider value, where:
Output frequency = timer base frequency / clock divider
Use the maximum baud rate compute the correct baud rate for the processor specific baud rate initialize
function (See Fossil Extended line control initialization function).
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Baud rate = maximum baud rate / baud rate divider
HAL Initialize Timer Settings
Interrupt 0xA1 service 0x8B: HAL: Set Timer Duty Cycle Waveform
Parameters
AH
AL
Set the duty cycle waveform of specified timer.
Must be 0x8B.
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