MMC2107 - Freescale Semiconductor

Timer Modules (TIM1 and TIM2)
Freescale Semiconductor, Inc.
In gated time accumulation mode (PAMOD = 1):
1 = Low PAI input enables divided-by-64 clock to pulse
accumulator and trailing rising edge on PAI sets PAIF flag.
0 = High PAI input enables divided-by-64 clock to pulse
accumulator and trailing falling edge on PAI sets PAIF flag.
NOTE:
The timer prescaler generates the divided-by-64 clock. If the timer is not
active, there is no divided-by-64 clock.
nc...
Freescale Semiconductor, I
To operate in gated time accumulation mode:
1. Apply logic 0 to RESET pin.
2. Initialize registers for pulse accumulator mode test.
3. Apply appropriate level to PAI pin.
4. Enable timer.
CLK[1:0] — Clock Select Bits
CLK[1:0] select the timer counter input clock as shown in Table 15-6.
Table 15-6. Clock Selection
CLK[1:0] Timer Counter Clock (1)
00 Timer prescaler clock (2)
01 PACLK
10 PACLK/256
11 PACLK/65536
1. Changing the CLKx bits causes an immediate change in the timer counter clock input.
2. When PAE = 0, the timer prescaler clock is always the timer counter clock.
PAOVI — Pulse Accumulator Overflow Interrupt Enable Bit
PAOVI enables the PAOVF flag to generate interrupt requests.
1 = PAOVF interrupt requests enabled
0 = PAOVF interrupt requests disabled
PAI — Pulse Accumulator Input Interrupt Enable Bit
PAI enables the PAIF flag to generate interrupt requests.
1 = PAIF interrupt requests enabled
0 = PAIF interrupt requests disabled
Technical Data MMC2107 – Rev. 2.0
316 Timer Modules (TIM1 and TIM2) MOTOROLA
For More Information On This Product,
Go to: www.freescale.com