Panasonic MN101C49K User Manual

 

Chapter 3 Register Setup of Each Function 

62 

3.9 8-bit Timer, Initializing Peripherals 

There are five 8-bit timers comprising timer 0 to 4. 

The timer comprises a binary counter, a compare register and a mode register. You can combine two 8-bit timers, 

timer 0 and 1 or 2 and 3, to use as a 16-bit timer. 

 

Binary counter 

This counter counts a clock selected by the prescaler or the mode register. 

 

Compare register 

This register determines the time base of a timer by specifying clock number counted by the binary counter. 

 

Mode register 

This register enables/disables the timer operation, and selects the clock source. The setting content of the 

mode register depends on the timer. 

 

Timer 0: 

BIT7: Unused   

BIT6: Unused 

BIT5: "0"   Normal operation 

 "1"   P22(IRQ2), pulse width measurement 

BIT4: "0"   Normal operation 

 "1"   PWM operation  

BIT3: "0"   Stop count 

 "1"   Count operation 

BIT2, 1, 0: Clock source selection 

000: High speed crystal clock oscillation frequency 

001: Timer 0, prescaler output signal 

010: Low speed crystal clock oscillation frequency 

011: Synchronous low speed crystal clock oscillation frequency 

110: Timer 0, pin input external signal 

111: Synchronous timer 0, pin input external signal 

 

Timer 1: 

BIT7: Not used 

BIT6: Not used 

BIT5: Not used 

BIT4: "0"   Normal operation 

 "1"   Cascade connection