19-2
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
19.2.
Input Pins and External Connections
19.2.1.
List of Input Pins
Table 19.2.1.1 lists the ADC12A pins.
Table 19.2.1.1 ADC12A pins.
Pin name
I/O
*
Initial status
*
Function
ADIN
nm
A
Hi-Z
Analog signal input
#ADTRG
n
I
I
External trigger input
VREFA
n
A
Hi-Z
Reference voltage input
* Indicates the status when the pin is configured for the ADC12A.
If the port is shared with the ADC12A pin and other functions, the ADC12A input function must be
assigned to the port before activating the ADC12A. F
or more information, refer to the “I/O Ports” chapte
r.
19.2.2.
External Connections
Figure 19.2.2.1 shows a connection diagram between the ADC12A and external devices.
Figure 19.2.2.1 Connections between ADC12A and External Devices
19.3.
Clock Settings
19.3.1.
ADC12A Operating Clock
The 16-bit timer Ch.
k
operating clock CLK_T16_
k
is also used as the ADC12A operating clock. For more
information on the CLK_T16_
k
settings and clock supply in SLEEP and DEBUG modes, refer to
“Clock
Settings”
in
the “16
-bit T
imers” chapte
r.
Note:
When the CLK_T16_
k
supply stops during A/D conversion (e.g., when the CPU enters SLEEP or
DEBUG mode), correct conversion results cannot be obtained even if the clock supply is resumed
after that. In this case, perform A/D conversion again.
DC-DC
converter
Sensor
VDD
VREFAn
ADIN
n
0
ADIN
nm
Sensor output
detection
Battery voltage
detection
3.3 V
S1C31 ADC12A
Summary of Contents for S1C31D50
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