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IV ANALOG BLOCK: A/D CONVERTER
B-IV-2-2 EPSON S1C33L03 FUNCTION PART
I/O Pins of A/D Converter
Table 2.1 shows the pins used by the A/D converter.
Table 2.1 I/O Pins of A/D Converter
Pin name I/O Function Function select bit
K52/#ADTRG I Input port / AD trigger CFK52(D2)/K5 function select register(0x402C0)
K60/AD0 I Input port / AD converter input 0 CFK60(D0)/K6 function select register(0x402C3)
K61/AD1 I Input port / AD converter input 1 CFK61(D1)/K6 function select register(0x402C3)
K62/AD2 I Input port / AD converter input 2 CFK62(D2)/K6 function select register(0x402C3)
K63/AD3 I Input port / AD converter input 3 CFK63(D3)/K6 function select register(0x402C3)
K64/AD4 I Input port / AD converter input 4 CFK64(D4)/K6 function select register(0x402C3)
K65/AD5 I Input port / AD converter input 5 CFK65(D5)/K6 function select register(0x402C3)
K66/AD6 I Input port / AD converter input 6 CFK66(D6)/K6 function select register(0x402C3)
K67/AD7 I Input port / AD converter input 7 CFK67(D7)/K6 function select register(0x402C3)
AVDDE –Analog reference voltage (+) –
AVDDE (analog power-supply pin)
AVDDE is the power-supply pin for the analog circuit. The voltage level supplied to this pin must be AVDDE
= VDDE.
Note: When the A/D converter is set to enabled state, a current flows between AV
DDE and VSS, and
power is consumed, even when A/D operations are not performed. Therefore, when the A/D
converter is not used, it must be set to the disabled state (default "0" setting of ADE (D2) in the
A/D enable register (0x40244)).
AD[7:0] (analog-signal input pins)
The analog input pins AD7 (Ch.7) through AD0 (Ch.0) are shared with input port pins K67 through K60.
Therefore, when these pins are used for analog input, they must be set for use with the A/D converter in the
software. This setting can be made individually for each pin. At cold start, all these pins are set for input
ports.
The analog input voltage AV
IN can be input in the range of VSS ≤ AVIN ≤ AVDDE.
#ADTRG (external-trigger input pin)
This pin is used to input a trigger signal to start A/D conversion from an external source. Since this pin is
shared with input port K52, it must be set for use with the A/D converter in the software before an external
trigger can be applied to the pin. At cold start, this pin is set for an input port.
Method for setting A/D-converter input pins
At cold start, the #ADTRG and AD[7:0] pins all are set for input ports Kxx (function select bit CFKxx = "0").
When using these pins for the A/D converter, write "1" to the function select bit CFKxx.
At hot start, these pins retain their state from prior to the reset.