ZAMC4100GA2R datasheet(111/156 Pages) RENESAS

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ZAMC4100 Datasheet

111

January 26, 2016

4.4.2.

Interrupts Configuration

As defined in Table 4.3, the MCU peripheral interrupts can have one of two types of interrupt input responses:

level-sensitive or pulse (edge) triggered:

Table 4.3

MCU Peripheral Interrupts

Interrupt Line

MCU Peripheral Interrupt

Type

Interrupt line 0

Flash controller interrupt

Level-sensitive

Interrupt line 1

External interrupt (from SBC)

Level-sensitive

Interrupt line 2

SW-LIN interrupt

Level-sensitive

Interrupt line 3

SPI interrupt

Level-sensitive

Interrupt line 4

32-bit timer interrupt

Pulse

Interrupt line 5

GPIO interrupt

Level-sensitive

The effect of the pulse and level type is explained in the ARM™ Cortex™-M0 Documentation Kit in the NVIC

section.

4.5.

GPIO Module

4.5.1.

Overview

There are 8 GPIO pins (GPIO00 to GPIO07) implemented in the MCU. Each GPIO pin can be individually

configured to operate as an input or output. When configured as an output, the value driven out of the GPIO pin

can be directly written or controlled via a set-clear register (see section 4.5.3).

GPIO pin configurations:

•

Output mode: enabled by clearing a corresponding bit in registers GPIO_DIR (Table 4.9) and GPIO_OUT

(Table 4.11); e.g., bit 0 = GPIO00 configuration, bit 1 = GPIO01, etc.

•

Schmitt trigger input mode with internal pull-down resistors: enabled by setting a corresponding bit in

registers GPIO_DIR and GPIO_IN (Table 4.10)

•

Generation of interrupt events on a selectable edge

•

Trigger source for the 32-bit timer

By default all GPIOs are set in input mode. Each register in a GPIO module can be accessed with a byte, half-

word and word size.

4.5.2.

GPIO Input Mode (default)

Assigned bits in register GPIO_DIR must be cleared for the input operation for a specific GPIO pin (bit numbers

correspond to GPIO numbers). The value for each pin can be read by reading register GPIO_IN. The values from

any GPIO pins that are configured as outputs or which have other functionality should be ignored.

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