ML620Q503/Q504 User's Manual
Chapter 23 Melody Driver
FEUL620Q504 23-7
23.3 Description of Operation
23.3.1 Operation of Melody Output
Melody is output in the following procedure.
(1)
Select melody mode by setting the BZMD bit of the melody 0 control register (MD0CON) to “0”.
(2)
Set a melody tempo in the melody 0 tempo code register (MD0TMP).
(3)
Set a tone length code in the melody 0 tone length code register (MD0LEN).
(4)
Set a scale code in the melody 0 scale code register (MD0TON).
(5)
When the M0RUN bit of the melody 0 control register (MD0CON) is set to “1”, the tone length code and
scale code are transferred to the tone length buffer and scale buffer and melody output is started from the
MD0 pin. At the same time, a melody 0 interrupt (MD0INT) is requested. When an interrupt occurs and
program is passed to the interrupt routine, the interrupt request flag is cleared.
The melody 0 signal output pin (MD0) is assigned as the secondary function of Port 3 or Port 4 or Port 5. For the
secondary function of Port 3 or Port 4 or Port 5, see Chapter 20, "Port 3" or Chapter 21, "Port 4", Chapter 22,
"Port 5".
In the software processing after melody 0 interrupt, the tone length code and the scale code of the note that are
output next are set to MD0LEN and MD0TON, respectively. When there is no next note to be output, rest data
“00H” is set in MD0TON, the M0RUN bit is set to “0” by the software processing after the next melody 0
interrupt, and melody output is terminated.
By setting the M0RUN bit to “0”, melody can be terminated forcibly during melody output.
Figure 23-2 shows the operation waveform of the melody driver.
Figure 23-2 Operation Waveform of Melody Driver
M0RUN
MD0INT
XX
1
st
sound
2
nd
sound
XX
1
st
sound waveform
2
nd
sound
3
rd
sound
3
rd
sound
Final sound
Rest data
Final sound
Rest data
MD0LEN
MD0TON
Tone length/Scale buffer
Melody output waveform
MD0*
2
nd
sound
waveform
3
rd
sound
waveform
1
st
sound
Final sound waveform
Содержание LAPIS SEMICONDUCTOR ML620Q503
Страница 2: ...ML620Q503 Q504 User s Manual Issue Date Apr 16 2015 FEUL620Q504 01...
Страница 18: ...Chapter 1 Overview...
Страница 32: ...Chapter 2 CPU and Memory Space...
Страница 44: ...Chapter 3 Reset Function...
Страница 50: ...Chapter 4 Power Management...
Страница 70: ...Chapter 5 Interrupts...
Страница 134: ...Chapter 6 Clock Generation Circuit...
Страница 161: ...Chapter 7 Time Base Counter...
Страница 170: ...Chapter 8 Timers...
Страница 183: ...Chapter 9 Function Timer FTM...
Страница 231: ...Chapter 10 Watchdog Timer...
Страница 239: ...Chapter 11 Synchronous Serial Port SSIO...
Страница 251: ...Chapter 12 Synchronous Serial Port with FIFO SSIOF...
Страница 283: ...Chapter 13 UART...
Страница 303: ...Chapter 14 UART with FIFO UARTF...
Страница 327: ...Chapter 15 I2 C Bus Interface...
Страница 344: ...Chapter 16 Port XT...
Страница 350: ...Chapter 17 Port 0...
Страница 361: ...Chapter 18 Port 1...
Страница 368: ...Chapter 19 Port2...
Страница 379: ...Chapter 20 Port 3...
Страница 395: ...Chapter 21 Port 4...
Страница 410: ...Chapter 22 Port 5...
Страница 426: ...Chapter 23 Melody Driver...
Страница 439: ...Chapter 24 RC Oscillation type A D Converter RC ADC...
Страница 462: ...Chapter 25 Successive Approximation Type A D Converter SA ADC...
Страница 479: ...Chapter 26 Analog Comparator...
Страница 489: ...Chapter 27 Flash Memory Control...
Страница 505: ...Chapter 28 Voltage Level Supervisor VLS...
Страница 517: ...Chapter 29 LLD circuit...
Страница 519: ...Chapter 30 On Chip Debug Function...
Страница 522: ...Appendixes...
Страница 552: ...Revision History...