Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Uživatelský manuál stáhnout pdf (Strana 40)

MAXQ Family User’s Guide:

MAXQ8913 Supplement

6-8

6.2 Port Pin Examples

6.2.1 Port Pin Example 1: Driving Outputs on Port 0

move PO0, #000h ; Set all outputs low

move PD0, #0FFh ; Set all P0 pins to output mode

6.2.2 Port Pin Example 2: Receiving Inputs on Port 0

move PO0, #0FFh ; Set weak pullups ON on all pins

move PD0, #000h ; Set all P0 pins to input mode

nop ; Wait for external source to drive P0 pins

move Acc, PI0 ; Get input values from P0 (will return FF if

; no other source drives the pins low)

Maxim Integrated

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Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Uživatelský manuál Strana 40