PIC16F1934-ESLASHML datasheet(103/418 Pages) MICROCHIP

103 / 418 page

Preliminary

DS41364A-page 101

PIC16F193X/LF193X

6.6.1

ANSELE REGISTER

The ANSELE register (Register 6-22) is used to

configure the Input mode of an I/O pin to analog.

Setting the appropriate ANSELE bit high will cause all

digital reads on the pin to be read as ‘0’ and allow

analog functions on the pin to operate correctly.

The state of the ANSELE bits has no affect on digital

output functions. A pin with TRIS clear and ANSEL set

will still operate as a digital output, but the Input mode

will be analog. This can cause unexpected behavior

when executing read-modify-write instructions on the

affected port.

The TRISE register (Register 6-21) controls the PORTE

pin output drivers, even when they are being used as

analog inputs. The user should ensure the bits in the

TRISE register are maintained set when using them as

analog inputs. I/O pins configured as analog input always

read ‘0’.

Note:

The ANSELE register must be initialized to

configure an analog channel as a digital

input. Pins configured as analog inputs will

read ‘0’.

TRISE: PORTE TRI-STATE REGISTER

U-0

R-1

R/W-1

—

TRISE3

TRISE2(1)

TRISE1(1)

TRISE0(1)

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = bit is unchanged

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 7-4

Unimplemented: Read as ‘0’

bit 3

TRISE3: RE3 Port Tri-state Control bit

This bit is always ‘1’ as RE3 is an input only

bit 2-0

TRISE<2:0>: RE<2:0> Tri-State Control bits(1)

= PORTE pin configured as an input (tri-stated)

= PORTE pin configured as an output

Note

TRISE<2:0> are not implemented on the PIC16F1933/1936/1938/PIC16LF1933/1936/1938. Read as ‘0’.

ANSELE: PORTE ANALOG SELECT REGISTER

U-0

R/W-1

—

ANSE2(2)

ANSE1(2)

ANSE0(2)

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = bit is unchanged

x = Bit is unknown

-n/n = Value at POR and BOR/Value at all other Resets

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 7-3

Unimplemented: Read as ‘0’

bit 2-0

ANSE<2:0>: Analog Select between Analog or Digital Function on Pins RE<2:0>, respectively

= Digital I/O. Pin is assigned to port or digital special function.

= Analog input. Pin is assigned as analog input(1). Digital input buffer disabled.

Note

When setting a pin to an analog input, the corresponding TRIS bit must be set to Input mode in order to allow external

control of the voltage on the pin.

ANSELE register is not implemented on the PIC16F1933/1936/1938/PIC16LF1933/1936/1938. Read as ‘0’

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