Texas Instruments Tiva TM4C123GH6PM User Manual

System Tick (SysTick)
Returns:
None.
20.2.1.2 ROM_SysTickEnable
Enables the SysTick counter.
Prototype:
void
ROM_SysTickEnable(void)
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_SYSTICKTABLE is an array of pointers located at ROM_APITABLE[10].
ROM_SysTickEnable is a function pointer located at ROM_SYSTICKTABLE[1].
Description:
This will start the SysTick counter. If an interrupt handler has been registered, it is called when
the SysTick counter rolls over.
Note:
Calling this function will cause the SysTick counter to (re)commence counting from its current
value. The counter is not automatically reloaded with the period as specified in a previous
call to ROM_SysTickPeriodSet(). If an immediate reload is required, the NVIC_ST_CURRENT
register must be written to force this. Any write to this register clears the SysTick counter to 0
and will cause a reload with the supplied period on the next clock.
Returns:
None.
20.2.1.3 ROM_SysTickIntDisable
Disables the SysTick interrupt.
Prototype:
void
ROM_SysTickIntDisable(void)
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_SYSTICKTABLE is an array of pointers located at ROM_APITABLE[10].
ROM_SysTickIntDisable is a function pointer located at ROM_SYSTICKTABLE[4].
Description:
This function will disable the SysTick interrupt, preventing it from being reflected to the proces-
sor.
Returns:
None.
228 April 8, 2013

Texas Instruments Tiva TM4C123GH6PM Specifications

General

Core	ARM Cortex-M4F
Clock Speed	80 MHz
Flash Memory	256 KB
SRAM	32 KB
GPIO Pins	43
UART	8
I2C	2
SPI/SSI	4
USB	USB 2.0
Timers	6
Communication Interfaces	UART, I2C, SPI, USB
Operating Temperature	-40°C to 85°C
Package	LQFP64

Summary

Boot Loader

Introduction

Explains the ROM-based boot loader and its interfaces for flash updates.

Serial Interfaces

Details the UART, SSI, and I2C interfaces used by the boot loader.

USB Interface

Describes the USB boot loader functionality using the DFU protocol.

Controller Area Network (CAN)

Flash

GPIO

Hibernation Module

Inter-Integrated Circuit (I2C)

Interrupt Controller (NVIC)

Memory Protection Unit (MPU)

Pulse Width Modulator (PWM)

Synchronous Serial Interface (SSI)

System Control

Timer

UART

uDMA Controller

USB Controller

Using USB with the uDMA Controller

Watchdog Timer

Introduction

Functions

Lists and describes API functions for watchdog timer configuration, interrupts, and lock mechanism.