Controller - Institute of Transportation Engineers

timer34 = access to MC68360's internal timer #3 & #4 (cascaded)
4.2.7.2.3.2 Timer descriptor option structure
The driver shall change appropriate functions only and ignore values that do not apply to
a particular timer function. The data structures are as follows:
struct TER /* timer event register */
{
u_int16 reserveTER :14; /* reserved */
u_int16 timerREF :1; /* output Reference Event */
u_int16 timerCAP :1; /* Capture event */
};
struct TMR /* timer mode register */
{
unsigned timerPS :8; /* prescale */
unsigned timerCE :2; /* capture edge/enable interrupts */
unsigned timerOM :1; /* output mode */
unsigned timerORI :1; /* output reference enable */
unsigned timerFRR :1; /* free run or restart */
unsigned timerICLK :2; /* input clock source */
unsigned timerGE :1; /* gate enable */
};
struct TGCR /* timer global configuration register */
{
unsigned reserveTGCR :12; /* reserved */
unsigned timerCAS_GM :1; /* cascade timers / Gate mode */
unsigned timerFRZ :1; /* freeze timer */
unsigned timerSTP :1; /* stop timer */
unsigned timerRST :1; /* reset timer */
};
typedef struct
{
union
{
struct TGCR TGCR; /* timer global configuration register */
unsigned short tgcr;
} uTGCR;
union
{
struct TMR TMR; /* timer mode register */
unsigned short tmr;
Standard for the ATC – Type 2070 March 29, 2001
33