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User’s Manual U15104EJ2V0UD
CHAPTER 9 BUZZER OUTPUT CONTROLLER
9.1 Functions of Buzzer Output Controllers
The
µ
PD178054 Subseries has the following two types of buzzer output controllers.
• BEEP0
• BUZ
BEEP0 outputs a square wave of the buzzer frequency selected by BEEP clock select register 0 (BEEPCL0) from
the BEEP0/P36 pin.
BUZ outputs a square wave of the buzzer frequency selected by the clock output select register (CKS) from the
BUZ/P37 pin.
Figures 9-1 and 9-2 show the block diagrams of BEEP0 and BUZ.
Figure 9-1. Block Diagram of BEEP0
Figure 9-2. Block Diagram of BUZ
Remark
f
X
: System clock frequency
Internal bus
BEEP
CL02
BEEP
CL01
BEEP
CL00
BEEP clock select
register 0 (BEEPCL0)
BEEP0/P36
1 kHz
1.5 kHz
3 kHz
4 kHz
Output latch
(P36)
PM36
Selector
Internal bus
BZOE BCS1 BCS0
Clock output
select register (CKS)
BUZ/P37
f
X
/2
10
f
X
/2
11
f
X
/2
12
f
X
/2
13
Output latch
(P37)
PM37
Selector
Содержание mPD178053
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