mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 492

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 16 Timer Module (TIM16B8CV1)
Write: Anytime for output compare function.Writes to these registers have no meaning or effect during
input capture. All timer input capture/output compare registers are reset to 0x0000.
16.3.2.15 16-Bit Pulse Accumulator Control Register (PACTL)
When PAEN is set, the PACT is enabled.The PACT shares the input pin with IOC7.
Read: Any time
Write: Any time
492
CLK[1:0]
PAMOD
PEDGE
Reset
PAEN
Field
3:2
6
5
4
W
R
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
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
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
1 IOC7 input pin low enables M (bus clock) divided by 64 clock to Pulse Accumulator and the trailing rising edge
Clock Select Bits — Refer to
0
0
7
edge on IOC7 sets the PAIF flag.
on IOC7 sets the PAIF flag.
Read/Write access in byte mode for high byte should takes place before low
byte otherwise it will give a different result.
16-18.
Figure 16-24. 16-Bit Pulse Accumulator Control Register (PACTL)
Unimplemented or Reserved
PAEN
0
6
Table 16-17. PACTL Field Descriptions
PAMOD
MC9S12HZ256 Data Sheet, Rev. 2.05
Table
0
5
16-19.
PEDGE
NOTE
0
4
Table
Description
16-18.
CLK1
0
3
CLK0
0
2
Freescale Semiconductor
PAOVI
0
1
PAI
0
0