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18 SOUND GENERATOR (SNDA)
18.2 Output Pins and External Connections
18.2.1 List of Output Pins
Table 18.2.1.1 lists the SNDA pins.
Pin name
BZOUT
#BZOUT
If the port is shared with the SNDA pin and other functions, the SNDA output function must be assigned to the port
before activating the SNDA. For more information, refer to the "I/O Ports" chapter.
18.2.2 Output Pin Drive Mode
The drive mode of the BZOUT and #BZOUT pins can be set to one of the two types shown below using the SN-
DASEL.SINV bit.
Direct drive mode (SNDASEL.SINV bit = 0)
This mode drives both the BZOUT and #BZOUT pins to low while the buzzer signal output is off to prevent
the piezoelectric buzzer from applying unnecessary bias.
Normal drive mode (SNDASEL.SINV bit = 1)
In this mode, the #BZOUT pin always outputs the inverted signal of the BZOUT pin even when the buzzer out-
put is off.
18.2.3 External Connections
Figures 18.2.2.1 and 18.2.2.2 show connection diagrams between SNDA and a piezoelectric buzzer.
Figure 18.2.2.1 Connection between SNDA and Piezoelectric Buzzer (Direct Drive)
Figure 18.2.2.2 Connection between SNDA and Piezoelectric Buzzer (Single Pin Drive)
18-2
Table 18.2.1.1 List of SNDA Pins
I/O*
Initial status*
O
O (Low)
O
O (Low)
BZOUT
#BZOUT
S1C31 SNDA
BZOUT
S1C31 SNDA
Seiko Epson Corporation
Function
Non-inverted buzzer output pin
Inverted buzzer output pin
* Indicates the status when the pin is configured for SNDA
Piezoelectric
buzzer
V
DD
Piezoelectric
buzzer
S1C31W74 TECHNICAL MANUAL
(Rev. 1.1)
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