ML63611 User’s Manual
Chapter 11 Melody Driver (MELODY)
11 – 10
OPTION B (D): 1.5 V (3.0 V), With regulator
circuit for LCD bias
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
11.5
Buzzer Circuit Operation
When EMBD (bit 2 of MDCON) is set to “1”, a buzzer driver signal is sent to the melody driver output pins (MD,
MDB).
Four buzzer output modes can be selected by MBM1 (bit 1 of MDCON) and MBM0 (bit 0 of MDCON): two
types of intermittent tones, a single tone, or a continuous tone output. The buzzer output frequency is 4 kHz and
has a 50% duty ratio.
In the intermittent tone 1 mode, a waveform synchronized to the 8 Hz output of the time base counter is output.
In the intermittent tone 2 mode, a waveform synchronized to the logical AND of 8 Hz signal output and a “L”
level of 1 Hz signal of the time base counter is output.
In the single tone mode, output starts in synchronization with the rising edge of EMBD. At the second falling
edge of the 32 Hz output of the time base counter, EMBD is cleared to “0” and output is stopped.
In the continuous tone mode, output is continued while EMBD is “1”.
While the melody is being output (MSF (bit 3 of MDCON) = “1”), the buzzer output is turned OFF. If melody
output is started during buzzer output, EMBD is cleared to “0”, the buzzer output is stopped, and melody output is
given priority.
Figure 11-5 shows the output waveforms of each mode. Shaded sections indicate the 4 kHz output frequency.
Содержание ML63611
Страница 9: ...Chapter 1 Overview...
Страница 33: ...Chapter 2 CPU and Memory Spaces...
Страница 42: ...Chapter 3 CPU Control Functions...
Страница 49: ...Chapter 4 Interrupt INT...
Страница 62: ...Chapter 5 Clock Generator Circuit OSC...
Страница 71: ...Chapter 6 Time Base Counter TBC...
Страница 75: ...Chapter 7 Timers TIMER...
Страница 99: ...Chapter 8 100 Hz Timer Counter 100HzTC...
Страница 103: ...Chapter 9 Watchdog Timer WDT...
Страница 108: ...Chapter 10 Ports INPUT I O PORT...
Страница 140: ...Chapter 11 Melody Driver MELODY...
Страница 152: ...Chapter 12 Serial Port SIO...
Страница 179: ...Chapter 13 LCD Driver LCD...
Страница 200: ...Chapter 14 Battery Low Detect Circuit BLD...
Страница 204: ...Chapter 15 Power Supply Circuit POWER...
Страница 215: ...Chapter 16 A D Converter ADC...
Страница 238: ...Appendixes...
Страница 271: ...ML63611 User s Manual First Edition May 2001 Second Edition June 2001 2001 Oki Electric Industry Co Ltd PEUL63611 02...