Features; Functional Descriptions; External Interrupt Pin Selection; Figure 22. Exti Channel Input Selection - Holtek HT32F50231 User Manual

32-Bit Arm ® Cortex ® -M0+ MCU
HT32F50231/HT32F50241

Features

▄
APB slave interface for register access
▄
EXTI source selection
▄
Configurable pin function for each GPIO, up to sixteen alternative functions on each pin
▄
AFIO lock mechanism

Functional Descriptions

External Interrupt Pin Selection

The GPIO pins are connected to the 16 EXTI lines as shown in the accompanying figure. For
example, users can set the EXTI0PIN [3:0] field in the ESSR0 register to b0000 to select the GPIO
PA0 pin as EXTI line 0 input. Since not all the pins of the Port A ~ C are available in all package
types, please refer to the pin assignment section for detailed pin information. The setting of the
EXTInPIN [3:0] field is invalid when the corresponding pin is not available.
PA0
PB0
PC0
PA15
PB15
PC15

Figure 22. EXTI Channel Input Selection

Rev. 1.00
EXTIx Pin Selection
EXTI0PIN[3:0]
0000
0001
0010
EXTI15PIN[3:0]
0000
0001
0010
140 of 486
EXTI 0
EXTI 15
July 31, 2018