I/O Pins Of A/D Converter - Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual

IV ANALOG BLOCK: A/D CONVERTER

I/O Pins of A/D Converter

Table 2.1 shows the pins used by the A/D converter.
Pin name I/O
K52/#ADTRG I Input port / AD trigger
K60/AD0 I Input port / AD converter input 0
K61/AD1 I Input port / AD converter input 1
K62/AD2 I Input port / AD converter input 2
K63/AD3 I Input port / AD converter input 3
K64/AD4 I Input port / AD converter input 4
K65/AD5 I Input port / AD converter input 5
K66/AD6 I Input port / AD converter input 6
K67/AD7 I Input port / AD converter input 7
AV – Analog reference voltage (+)
DDE
AV (analog power-supply pin)
DDE
AV is the power-supply pin for the analog circuit. The voltage level supplied to this pin must be AV
DDE
= V .
DDE
Note: When the A/D converter is set to enabled state, a current flows between AV
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
#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.
B-IV-2-2
Table 2.1 I/O Pins of A/D Converter
Function
can be input in the range of V
IN
EPSON
Function select bit
CFK52(D2)/K5 function select register(0x402C0)
CFK60(D0)/K6 function select register(0x402C3)
CFK61(D1)/K6 function select register(0x402C3)
CFK62(D2)/K6 function select register(0x402C3)
CFK63(D3)/K6 function select register(0x402C3)
CFK64(D4)/K6 function select register(0x402C3)
CFK65(D5)/K6 function select register(0x402C3)
CFK66(D6)/K6 function select register(0x402C3)
CFK67(D7)/K6 function select register(0x402C3)
–
AV AV .
SS IN DDE
DDE
and V , and
DDE SS
S1C33L03 FUNCTION PART