Class _tm23a: 23-bit timer

A class _tm23a object is a 23-bit timer.

It is used in:

• ESP8266 : timer1 and timer2

Configuration

hwa( configure,   timer0,
 
     //  Clock source
     //
   [ clock,       apb                    // APB clock
                | apb /   1              // APB clock
                        | 16             // APB clock divided by 16
                        | 256, ]         // APB clock divided by 256
 
     //  Counting mode
     //
   [ direction,   stop                   // Stop
                | down                   // Count down to 0 and stop
                | down_loop, ]           // Count down to 0 and reload
 
     //  Class _tm23a timers all count from top down to 0
     //
   [ bottom,      0, ]
 
     //  The value the counter loads after 0 is reached
     //
   [ top,         VALUE, ]               // VALUE: 0 .. 0x7FFFFF
 
     //  Action triggered after 0 is reached
     //
   [ action,      none
                | irq
                | nmi  ] );

Count

The read instruction returns the content of the counting register:

uint32_t count = hw( read, timer0 );

The hw_write() instruction sets the content of the counting register:

hw( write, timer0, VALUE );