Timer T3 (8 bits) controls the LED via interrupts

The T3 timer (8-bit) of CC2530 requires understanding of T3CTL, T3CCTL0, T3CC0, T3CCTL1, and T3CC registers. Timer 3/4 is an 8-bit timer with timer/counter/PWM functions.

Timer 2, also known as MAC timer, is specially designed to support the event tracking protocol in IEEE 802.15.4 MAC. The timer has an 8-bit overflow counter that can be used to record the number of cycles that have occurred; a 16-bit capture register to record the exact time when a frame start delimiter is received/sent or the exact time when the transmission is completed; and a 16-bit output compare register to generate various command selection signals (start receiving, start sending, etc.) to the wireless module at a specific time. If you want to know more about Timer 2, you can refer to the relevant information.

Have you found that as long as the registers are configured correctly, there will be no problem with the rest.

The function of T3CTL (0XCB) is the control and status of timer 3

Bit[7:5]: Timer clock frequency division multiple selection: 
000: No frequency division 001: 2 frequency division 010: 4 frequency division 
011: 8 frequency division 100: 16 frequency division 101: 32 frequency division 
110: 64 frequency division 111: 128 frequency division 
Bit4: T3 start and end control bit 
Bit3: Overflow interrupt mask 0: Disable overflow interrupt 1: Enable overflow interrupt
Bit2: Clear count value high level valid 
Bit[1:0] T3 mode selection 
00: Automatic reload 0x00-0xFF 
01: DOWN (count from T3CC0 to 0X00 once) 
10: Modulo counting (count from 0X00 to T3CC0 repeatedly) 
11: UP/DOWN (count from 0X00 to T3CC0 and then to 0X00 repeatedly)

T3CCTL0 (0xCC) is the T3 channel 0 capture/compare control register 

Bit6: Channel 0 interrupt mask 0: Interrupt disable 1: Interrupt enable 
Bit[5: 3] T3 channel 0 comparison output mode selection 
Bit2: T3 channel 0 mode selection: 0: Capture 1: Compare 
Bit[1:0] T3 channel 0 capture mode selection 
00 No capture 01 Rising edge capture 10 Falling edge capture 11 Edge capture

T3CC0 (0xCD) is the capture/compare value of timer 3 channel 0. 
When T3CCTL0.MODE = 1 (compare mode), writing this register will cause T3CC0.VAL[7:0] to update to the input value to be delayed until T3CNT.CNT[7:0] = 0x00.

 
T3CCTL1 (0xCE) is T3 channel 1 capture/compare control register 

Bit6: Channel 1 interrupt mask 0: Interrupt disable 1: Interrupt enable 
Bit[5: 3] T3 channel 1 comparison output mode selection 
Bit2: T3 channel 1 mode selection: 0: Capture 1: Compare 

Bit[1:0] T3 Channel 1 capture mode selection 00 No capture 01 Rising edge capture 
   10 Falling edge capture 11 Edge capture  

T3CC1(0xCF) Timer 3 Channel 1 Capture/Compare Value 
Timer capture/compare value channel 1. When T3CCTL1.MODE = 1 (compare mode), writing this register will cause T3CC1.VAL[7:0] to update the written value and delay until T3CNT.CNT[7:0] = 0x00.

Configure T3 as follows. Since timer T3 is 8 bits, the configuration is slightly different. 
T3CTL |= 0x08; //Open overflow interrupt 
T3IE = 1; //Open general interrupt and T3 interrupt 
T3CTL |= 0xE0; //128 frequency division, 128/16000000*N=0.5S, N=62500 
T3CTL &= ~0x03; //Auto reload 00->0xff 62500/255=245 (times) 
T3CTL |= 0x10; //Start 
EA = 1; //Open general interrupt 

/****************************************************************************
* Description: Timer T3 controls LED flashing through interruption
**************************************************************************/
#include
typedef unsigned char uchar;
typedef unsigned int uint;
#define LED1 P1_0 // P1.0 port controls LED1
uint count; //Used for timer counting
/****************************************************************************
* Name: InitLed()
* Function: Set the corresponding IO port of the LED lamp
* Input parameters: None
* Output parameters: None
***************************************************************************/
void InitLed(void)
{
    P1DIR |= 0x01; //P1.0 is defined as output
    LED1 = 1; //Make the LED1 lamp off by default when powered on     
}


/****************************************************************************
* Name: InitT3()
* Function: Timer initialization. When the system is not configured with a working clock, the default frequency is 2 division, i.e. 16MHz
* Input parameter: None
* Output parameter: None
****************************************************************************/
void InitT3()
{     
    T3CTL |= 0x08 ; //Open overflow interrupt     
    T3IE = 1; //Open total interrupt and T3 interrupt
    T3CTL |= 0xE0; //128 division, 128/16000000*N=0.5S, N=62500
    T3CTL &= ~0x03; //Automatically reload 00->0xff 62500/255=245(times)
    T3CTL |= 0x10; //Start
    EA = 1; //Open total interrupt
}

//Timer T3 interrupt processing function
#pragma vector = T3_VECTOR 
__interrupt void T3_ISR(void) 
{ 
    IRCON = 0x00; //Clear interrupt flag, can also be done automatically by hardwareif 
    (count++ > 244) //After 245 interrupts, LED is inverted and flashes once (about 0.5 seconds) 
    { //Measured by oscilloscope to ensure accuracycount
        = 0; //Count clearLED1 
        = ~LED1; //Change the state of LED1
    } 
}

/********************************************************************************
* Program entry function
********************************************************************/
void main(void)
{
    InitLed(); //Set the corresponding IO port of LED lightInitT3
    (); //Set the corresponding register of T3while
    (1)
    {};
}