參數(shù)資料
型號: MC68HC05L25PB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52
封裝: TQFP-52
文件頁數(shù): 139/152頁
文件大?。?/td> 897K
代理商: MC68HC05L25PB
Time Base Submodules
MC68HC05L25 Data Sheet, Rev. 3.1
Freescale Semiconductor
87
9.2.6 Buzzer Tone Generator
The PA3/KWI3/BZ pin functions as a general-purpose I/O port after reset. The BZPE bit must be set in
order to use this port as buzzer tone output. The BZ outputs idle state is set by the BPOL bit when BZON
is cleared. The BZCLK signal selected by the BCLK bit is output on the pin when BZON is set. The BZ
output pin is open drain.
Figure 9-4. Buzzer Tone Output Control
Table 9-5. Buzzer Frequency
TBCR1
TBCLK
TBCR3BCLK
Buzzer Frequency on BZ Pin (BZCLK)
fOSC = 2 MHz
fXOSC = 32.768 kHz
fOSC = 3.6 MHz
fXOSC = 32.768 kHz
fOSC = 4 MHz
fXOSc = 32.768 kHz
fOSC = 4.194304 MHz
fXOSC = 32.768 kHz
0
4096 Hz
0
1
2048 Hz
10
Approximately
1953 Hz
Approximately
3516 Hz
Approximately
3906 Hz
4096 Hz
11
Approximately
977 Hz
Approximately
1758 Hz
Approximately
1953 Hz
2048 Hz
BZPE
BZON
BPOL
PC2 I/O PORT
BZ PORT
PC2 I/O PORT
CLOCK OUT
PA3/BZ*
BZCLK
IDLE
*The BZ output pin is open drain. The logic 1 shown for the BZ pin is actually a hi-Z state unless it is a pullup.
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