CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)

PTOUT: TOUT output control register (FFC1H•D2)

Controls the TOUT output.

When "1" is written: TOUT output ON

When "0" is written: TOUT output OFF

Reading: Valid

By writing "1" to the PTOUT register when the R02 register has been set to "1" and the R02HIZ register has been set to "0", the TOUT signal is output from the R02 terminal. When "0" is written, the R02 terminal goes high (VDD).

When using the R02 output port for general-purpose output, fix this register at "0". At initial reset, this register is set to "0".

FOUTE: FOUT output control register (FF06H•D3)

Controls the FOUT output.

When "1" is written: FOUT output ON

When "0" is written: FOUT output OFF

Reading: Valid

By writing "1" to the FOUTE register when the R03 register has been set to "1" and the R03HIZ register has been set to "0", an FOUT signal is output from the R03 terminal. When "0" is written, the R03 terminal goes high (VDD).

When using the R03 output port for general-purpose output, fix this register at "0". At initial reset, this register is set to "0".

FOFQ0, FOFQ1: FOUT frequency selection register (FF06H•D0, D1)

Selects a frequency of the FOUT signal.

Table 4.5.5.2 FOUT clock frequency

FOFQ1

FOFQ0

Clock frequency

1

1

fOSC3

1

0

fOSC1

0

1

fOSC1 ⋅

1/8

0

0

fOSC1 ⋅

1/64

 

 

 

 

At initial reset, this register is set to "0".

CTMO: R10 output selection register (FF13H•D0)

Selects the R10 terminal function.

When "1" is written: XTMUTE output

When "0" is written: General-purpose DC output

Reading: Valid

When using the R10 terminal for the XTMUTE output, write "1" to this register. Furthermore, fix the R10 register at "1" and the R10HIZ register at "0". Refer to Section 4.14, "Telephone Function", for controlling the XTMUTE output.

When using the R10 output port for a general-purpose output, fix this register at "0". At initial reset, this register is set to "0".

S1C63558 TECHNICAL MANUAL

EPSON

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