EM35X-DEV-IAR Ember, EM35X-DEV-IAR Datasheet - Page 54

• Manufacturer Part Number: EM35X-DEV-IAR
• Description: KIT DEV EM35X IAR EWARM ZIGBEE
• Manufacturer: Ember
• Series: EM35xr
• Type: Zigbeer

Specifications of EM35X-DEV-IAR

• Frequency: 2.4GHz
• For Use With/related Products: EM351, EM357
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 636-1027

7
7.1
GPIO (General Purpose Input / Output)
GPIO Ports
The EM35x has 24 multi-purpose GPIO pins, which may be individually configured as:
The basic structure of a single GPIO is illustrated in Figure 7-1.
A Schmitt trigger converts the GPIO pin voltage to a digital input value. The digital input signal is then always
routed to the GPIO_PxIN register; to the alternate inputs of associated peripheral devices; to wake detection
logic if wake detection is enabled; and, for certain pins, to interrupt generation logic. Configuring a pin in
analog mode disconnects the digital input from the pin and applies a high logic level to the input of the
Schmitt trigger.
Only one device at a time can control a GPIO output. The output is controlled in normal output mode by the
GPIO_PxOUT register and in alternate output mode by a peripheral device. When in input mode or analog
mode, digital output is disabled.
The 24 GPIO pins are grouped into three ports: PA, PB, and PC. Individual GPIOs within a port are numbered 0
to 7 according to their bit positions within the GPIO registers.
Note: Because GPIO port registers’ functions are identical, the notation Px is used here to refer to PA, PB, or
PC. For example, GPIO_PxIN refers to the registers GPIO_PAIN, GPIO_PBIN, and GPIO_PCIN.
General purpose output
General purpose open-drain output
Alternate output controlled by a peripheral device
Alternate open-drain output controlled by a peripheral device
Analog
General purpose input
General purpose input with pull-up or pull-down resistor
Figure 7-1. GPIO Block Diagram
Final
7-1
EM351 / EM357
120-035X-000G