mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 356

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Timer Operation
15.2 Timer Operation
The timer units consist of four identical, independent 16-bit timers, timers 0–3. For timers
0 and 1, the clock input to the prescaler is selected from the main clock (divided by 1 or 16)
or from the corresponding timer input (TIN0 or TIN1) pin. For timers 2 and 3, the clock
input to the prescaler can be selected only from the main clock (divided by 1 or 16). TIN is
internally synchronized to the internal clock, with a synchronization delay between two and
three main clocks. The clock input source is selected by the CLK bits of the corresponding
timer mode register (TMR0–TMR3). The prescaler is programmed to divide the clock input
by values from 1 to 256. The output of the prescaler is used as an input to the 16-bit counter.
15-2
15
15
15
15
15
15
15
15
15
15
Timer Reference Register (TRR0)
Timer Reference Register (TRR2)
Timer Capture Register (TCAP0)
Timer Capture Register (TCAP2)
Prescaler
Prescaler
Timer Mode Register (TMR0)
Timer Mode Register (TMR 2)
Timer Event Register (TER0)
Timer Event Register (TER2)
Divider
Divider
Timer Counter (TCN0)
Timer Counter (TCN2)
Timer 0
Timer 2
Timer 1
Timer 3
Mode Bits
Mode Bits
Figure 15-1. Timer Block Diagram
Clock
Clock
0
0
0
0
0
0
0
0
0
0
MCF5272 User’s Manual
Data [16)
Generator
Generator
Detection
Detection
Capture
Capture
Timer
Clock
Timer
Clock
TOUT1
TOUT0
Interrupt (T1)
Interrupt (T0)
System Clock or
System Clock/16
UART1_RxD
UART0_RxD
Interrupt (T3)
Interrupt (T2)
System Clock or
System Clock/16
TIN1
TIN0
MOTOROLA