Figure 4-2 Led Lighting Circuit; Figure 4-3 Led On/Off Circuit Example (Schematic Diagram) - Fujitsu F2MC-8FX Series User Manual

MB95F136JBS
Microcontroller
(a) LED OFF
(a)LED 消灯

Figure 4-3 LED ON/OFF circuit example (schematic diagram)

The pin P14 is controlled by the PDR1 register and the DDR register. If using the ports as outputs,
write the value to be output to the bit corresponding to the pins in the PDR1 register (0: Low, 1:
High), and write "1" to the bits corresponding to the pins in the DDR1 register.
Next, regarding switch controls, the switches on the starter kit are connected to the pin P5, which is
the external interrupt input pin, and the general I/O ports on the microcontroller. This section
explains how to detect switch operations (i.e., when the switch is pushed) on the microcontroller
using the pins as external interrupt input pins (INT5).
An overview of the SW2 connection circuit in the starter kit is shown in "Figure 4-4 Connection
configuration between SW2 and microcontroller pins (schematic diagram)". In the starter kit, SW2 is
connected to the INT5 pin, which is the external interrupt input pin on the microcontroller. If SW2 is
not pressed (i.e., is OFF), the voltage applied to the INT5 pin on the microcontroller is VCC (5V),
which is High. Further, if SW 2 is pressed (i.e., is ON), the voltage applied to the INT5 pin is
grounded, so the INT5 (P5) pin input status is Low. Consequently, when SW2 is pushed, the
LED4:SML-210LT
29
P14/PPG0
LED5:SML-210LT
30
P15
LED6:SML-210LT
1
P16

Figure 4-2 LED lighting circuit

LED
LED
OFF
消灯
P14 端子
Pin P14
66
AN07-00200-03E
VCC5
R19: 3.3kΩ
R20: 3.3kΩ
R21: 3.3kΩ
Microcontroller
P14 端子
Pin P14
pin P14
(b) LED ON
(b)LED 点灯
LED
LED
ON
点灯