PIC17C752-08SLASHCL datasheet(87/328 Pages) MICROCHIP

87 / 328 page

DS30289A-page 87

PIC17C7XX

10.8

PORTH and DDRH Registers

(PIC17C76X only)

PORTH is an 8-bit wide bi-directional port. The corre-

sponding data direction register is DDRH.

A '1' in

DDRH conﬁgures the corresponding port pin as an

input. A '0' in the DDRH register conﬁgures the corre-

sponding port pin as an output. Reading PORTH

reads the status of the pins, whereas writing to

PORTH will write to the respective port latch.

The upper four bits of PORTH are multiplexed with

4 channels of the 10-bit A/D converter.

The remaining bits of PORTH are general purpose I/O.

Upon reset RH7:RH4 is automatically conﬁgured as

analog inputs, and must be conﬁgured in software to

be a digital I/O.

EXAMPLE 10-8: INITIALIZING PORTH

MOVLB

; Select Bank 8

MOVLW

0x0E

; Configure PORTH as

MOVPF

ADCON1

; digital

CLRF

PORTH, F

; Initialize PORTH data

;

latches before

;

the data direction

;

MOVLW

0x03

; Value used to init

;

data direction

MOVWF

DDRH

; Set RH<1:0> as inputs

;

RH<7:2> as outputs

Figure 10-17: Block Diagram of RH7:RH4

Data bus

WR PORTH

WR DDRH

RD PORT

Data Latch

DDRH Latch

VSS

I/O pin

PCFG3:PCFG0

To other pads

input

buffer

VDD

RD DDRH

To other pads

VAIN

CHS3:CHS0

Note: I/O pins have protection diodes to VDD and VSS.

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