PIC16F1847 datasheet(123/408 Pages) MICROCHIP

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 2011 Microchip Technology Inc.

Preliminary

DS41453B-page 123

PIC16(L)F1847

WPUA: WEAK PULL-UP PORTA REGISTER

U-0

R/W-1/1

U-0

—

WPUA5

—

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 7-6

Unimplemented:

Read as ‘0’

bit 5

WPUA5:

Weak Pull-up RA5 Control bit

If MCLRE in Configuration Word 1 = 0, MCLR is disabled):

= Weak Pull-up enabled(1)

= Weak Pull-up disabled

If MCLRE in Configuration Word 1 = 1, MCLR is enabled):

Weak Pull-up is always enabled.

bit 4-0

Unimplemented:

Read as ‘0’

Note 1:

Global WPUEN bit of the OPTION_REG register must be cleared for individual pull-ups to be enabled.

The weak pull-up device is automatically disabled if the pin is in configured as an output.

ANSELA: PORTA ANALOG SELECT REGISTER

U-0

R/W-1/1

—

ANSA4

ANSA3

ANSA2

ANSA1

ANSA0

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 7-5

Unimplemented:

Read as ‘0’

bit 4-0

ANSA<4:0>

: Analog Select between Analog or Digital Function on pins RA<4:0>, 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 1:

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.

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