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19.2. Input Pins and External Connections
19.2.1. List of Input Pins
Table 19.2.1.1 lists the ADC12A pins.
Pin name
I/O*
ADINnm
A
#ADTRGn
I
VREFAn
A
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. For more information, refer to the "I/O Ports" chapter.
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 Timers" chapter.
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.
19-2
Table 19.2.1.1 ADC12A pins.
Initial status*
Hi-Z
I
Hi-Z
* Indicates the status when the pin is configured for the ADC12A.
VDD
VREFAn
Sensor output
ADINn0
detection
Battery voltage
ADINnm
detection
S1C31 ADC12A
Seiko Epson Corporation
Function
Analog signal input
External trigger input
Reference voltage input
DC-DC
converter
Sensor
3.3 V
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
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