The program flow is shown in Figures 1 to 7.
Figure 1 Main program flow
Figure 2 Interrupt service subroutine flow
Figure 3 Low-pronunciation subroutine flow
Figure 4 High-pitched pronunciation subroutine flow
Figure 5 1s loud sound subroutine flow[page]
Figure 6 3-tone pronunciation subroutine flow
Figure 7 Delay 1s subroutine flow
Modular design of programs is a more commonly used programming method, which can facilitate reading and communication.
(1) Define port and register addresses.
(2) Define the reset vector and interrupt vector.
(3) Main program.
(4) INT interrupt processing function.
(5) R13 interrupt processing function.
(6) Low-pitched voicing subroutine. [page]
(7) High-pitch phonation subroutine.
(8) Sounding 1s subroutine.
(9) Turn off the TRM0 delay subroutine.
(10) The alarm subroutine sounds three times intermittently.
(11) Turn off the software delay subroutine.
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