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

DX
CX
Which Timer
0=Timer0 / 1=Timer 1
Mode
0=disable duty cycle / 1=enable duty cycle
Alternate clock divider (if DX = 1)
Return Value
none
Comments
Use this function to modify the timer waveform behavior. For example a 50% duty cycle waveform can
be generated by specifying here an alternate clock divider value in CX that is the same value as was
used for the main clock divider value set in the Timer Initialization function call.
Please note that the timer frequency will change if you use this function. If you disable the duty cycle,
the timer output will no longer generate a rectangle signal. When duty cycle mode is disabled, the
TMROUT pin switches low for only one clock cycle after the maximum count is reached. If you want an
alternate duty cycle waveform, compute it with the following formula:
Output frequency = Timer base frequency * 2
/ (divider high level + divider low level)
The divider high level is the divider set by the Timer Initialization function. The divider low
level is the alternate clock divider passed to this function in the CX register.
Related Topics
Top of list
Index page
HAL Initialize Timer Settings
Interrupt 0xA1 service 0x8C: HAL: Read Specific I/O Pin
Parameters
AH
AL
Read specified programmable I/O pin.
Must be 0x8C.
IPC@CHIP PIO No. [0..13]
Return Value
AX=0 PIO pin is low, AX!=0 PIO pin is high
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