PIC 12F629 - Đọc nút nhấn

**arm_cortex01** · 03-04-2011, 06:36 PM

GPIO is an 6-bit wide, bi-directional port. The corre-
sponding data direction register is TRISIO. Setting a
TRISIO bit (= 1) will make the corresponding GPIO pin
an input (i.e., put the corresponding output driver in a
Hi-impedance mode). Clearing a TRISIO bit (= 0) will
make the corresponding GPIO pin an output (i.e., put
the contents of the output latch on the selected pin).
-------------------------------------------------
The exception is GP3, which is input only and its
------------------------------------------------
TRISIO bit will always read as ‘1’. Example 3-1 shows
how to initialize GPIO.
__________________

--> chưa hiểu lắm.

03-04-2011, 06:36 PM	#3
arm_cortex01 Đệ tử 1 túi Tham gia ngày: Mar 2011 Bài gửi: 13 :	GPIO is an 6-bit wide, bi-directional port. The corre- sponding data direction register is TRISIO. Setting a TRISIO bit (= 1) will make the corresponding GPIO pin an input (i.e., put the corresponding output driver in a Hi-impedance mode). Clearing a TRISIO bit (= 0) will make the corresponding GPIO pin an output (i.e., put the contents of the output latch on the selected pin). ------------------------------------------------- The exception is GP3, which is input only and its ------------------------------------------------ TRISIO bit will always read as ‘1’. Example 3-1 shows how to initialize GPIO. __________________ --> chưa hiểu lắm.