PIC17C752-08SLASHPQ datasheet(66/320 Pages) MICROCHIP

66 / 320 page

PIC17C75X

DS30264A-page 66

Preliminary

Example 10-1 shows an instruction sequence to initial-

ize PORTA. The Bank Select Register (BSR) must be

selected to Bank 0 for the port to be initialized. The fol-

lowing example uses the MOVLB instruction to load the

BSR register for bank selection.

EXAMPLE 10-1: INITIALIZING PORTA

FIGURE 10-2: RA2 BLOCK DIAGRAM

MOVLB

; Select Bank 0

MOVLW

0xF3

;

MOVPF

PORTA

; Initialize PORTA

;

RA<3:2> are output low

;

RA<5:4> and RA<1:0>

;

are inputs

;

(outputs floating)

Note: I/O pin has protection diodes to VSS.

Data Bus

WR_PORTA

(Q4)

RD_PORTA

(Q2)

Peripheral data in

I2C Mode enable

SCL out

FIGURE 10-3: RA3 BLOCK DIAGRAM

FIGURE 10-4: RA4 AND RA5 BLOCK

DIAGRAM

Note: I/O pin has protection diodes to VSS.

Data Bus

WR_PORTA

(Q4)

RD_PORTA

(Q2)

Peripheral data in

SDA out

SSP Mode

“1”

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

Data Bus

RD_PORTA

(Q2)

Serial port output signals

Serial port input signal

OE = SPEN,SYNC,TXEN, CREN, SREN for RA4

OE = SPEN (SYNC+SYNC,CSRC) for RA5

PIC17C752-08/PQ Datasheet(PDF) 66 Page - Microchip Technology

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