MC9S12C Datasheet, PDF (453/680 Pages) Motorola, Inc – 16-Bit Microcontroller

Chapter 15 Timer Module (TIM16B8CV1) Block Description
Table 15-17. PACTL Field Descriptions
Field
6
PAEN
5
PAMOD
4
PEDGE
3:2
CLK[1:0]
1
PAOVI
0
PAI
Description
Pulse Accumulator System Enable — PAEN is independent from TEN. With timer disabled, the pulse
accumulator can function unless pulse accumulator is disabled.
0 16-Bit Pulse Accumulator system disabled.
1 Pulse Accumulator system enabled.
Pulse Accumulator Mode — This bit is active only when the Pulse Accumulator is enabled (PAEN = 1). See
Table 15-18.
0 Event counter mode.
1 Gated time accumulation mode.
Pulse Accumulator Edge Control — This bit is active only when the Pulse Accumulator is enabled (PAEN = 1).
For PAMOD bit = 0 (event counter mode). See Table 15-18.
0 Falling edges on IOC7 pin cause the count to be incremented.
1 Rising edges on IOC7 pin cause the count to be incremented.
For PAMOD bit = 1 (gated time accumulation mode).
0 IOC7 input pin high enables M (bus clock) divided by 64 clock to Pulse Accumulator and the trailing falling
edge on IOC7 sets the PAIF flag.
1 IOC7 input pin low enables M (bus clock) divided by 64 clock to Pulse Accumulator and the trailing rising edge
on IOC7 sets the PAIF flag.
Clock Select Bits — Refer to Table 15-19.
Pulse Accumulator Overflow Interrupt Enable
0 Interrupt inhibited.
1 Interrupt requested if PAOVF is set.
Pulse Accumulator Input Interrupt Enable
0 Interrupt inhibited.
1 Interrupt requested if PAIF is set.
PAMOD
0
0
1
1
PEDGE
0
1
0
1
Table 15-18. Pin Action
Pin Action
Falling edge
Rising edge
Div. by 64 clock enabled with pin high level
Div. by 64 clock enabled with pin low level
NOTE
If the timer is not active (TEN = 0 in TSCR), there is no divide-by-64
because the ÷64 clock is generated by the timer prescaler.
Freescale Semiconductor
MC9S12C-Family / MC9S12GC-Family
453
Rev 01.23