Specifications

I-72 EPSON S1C62N82 TECHNICAL HARDWARE

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Analog Voltage Comparator)

Table 4.10.1 lists the control bits of the analog voltage

comparator and their addresses.

Control of analog

voltage comparator

Comparator on/off control (0FBH D0)

Switches the analog voltage comparator circuit to on or off.

When 1 is written: Comparator turns on

When 0 is written: Comparator turns off

Reading: Valid

After an initial reset, this bit is set to 0.

While analog voltage comparator is ON, the consumed current

becomes large. Unless necessary, do not turn on the analog

comparator.

Comparator data (0FBH D1)

Shows the result of comparing CMPP and CMPM.

When 1 is read: CMPP voltage is greater than

CMPM voltage

When 0 is read: CMPP voltage is smaller than

CMPM voltage

Writing: Invalid

This bit is undefined when the CMPP and/or CMPM input

pin is disconnected, and is 1 when CMPON is 0.

After an initial reset, this bit is set to 1.

CMPON

Table 4.10.1 Control bits of analog voltage comparator

Note

CMPDT

Address Comment

D3 D2 D1 D0 Name SR 1 0

0FBH

CSDC 0 CMPDT CMPON

LCD drive switch

Voltage comparator ON/OFF

Static

+ > -

Dynamic

- > +

OFF

R/W R/W

CSDC

CMPDT

CMPON

Comparator's voltage condition:

1 = CMPP(+)input > CMPM(-)input,

0 = CMPM(-)input > CMPP(+)input