TMPM330 - Keil

Under development
8.4.3 16-bit Programmable Square Wave Output Mode (PPG)
TMPM330 (rev 0.4)8-27
TMPM330
Square waves with any frequency and any duty (programmable square waves) can be
output. The output pulse can be either low-active or high-active.
Programmable square waves can be output from the TB0OUT pin by triggering the timer
flip-flop (TB0FF) to reverse when the set value of the up-counter (UCO) matches the set
values of the timer registers (TB0RG0 and TB0RG1). Note that the set values of TB0RG0
and TB0RG1 must satisfy the following requirement:
(Set value of TB0RG0) < (Set value of TB0RG1)
Match with B0RG0
(INTTB0 interrupt)
Match with B0RG1
(INTTB1 interrupt)
TB0OUT pin
Fig. 8-2 Example of Output of Programmable Square Wave (PPG)
In this mode, by enabling the double buffering of TB0RG0, the value of register buffer 0 is
shifted into TB0RG0 when the set value of the up-counter matches the set value of
TB0RG1. This facilitates handling of small duties.
Match with TB0RG0
Up-counter = Q1
Match with TB0RG1
TB0RG0
(compare value)
Register buffer
Q1
Q2
Fig. 8-3 Register Buffer Operation
Up-counter = Q2
Trigger to shift to TB0RG1
Q2
Write TB0RG0
Q3
16-bit Timer/
Event Counters (TMRBs)