Pack Multiple Fields into a 16-bit Control Register

#include <stdio.h>
#include <stdint.h>

typedef struct 
{
    uint16_t mode:3;
    uint16_t speed:5;
    uint16_t revsd:2;
    uint16_t status:6;
} ctrl_reg_t;

typedef union 
{
    ctrl_reg_t ctrl_reg;
    uint16_t reg;
}ctrl_reg_u;

uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    
    ctrl_reg_u temp_reg = {0};
    temp_reg.ctrl_reg.mode = (mode & 0b111);
    temp_reg.ctrl_reg.speed = (speed & 0b11111);
    temp_reg.ctrl_reg.status = (status & 0b111111);
    
    return temp_reg.reg;
}

int main() {
    uint8_t mode, speed, status;
    scanf("%hhu %hhu %hhu", &mode, &speed, &status);

    uint16_t reg = pack_register(mode, speed, status);
    printf("%u", reg);
    return 0;
}