MC68HC11E0CB2 MOTOROLA [Motorola, Inc], MC68HC11E0CB2 Datasheet - Page 163
MC68HC11E0CB2
Manufacturer Part Number
MC68HC11E0CB2
Description
8-channel, 8-bit analog-to-digital (A/D) converter
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC11E0CB2.pdf
(268 pages)
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M68HC11E Family — Rev. 5
MOTOROLA
PAOVI and PAOVF — Pulse Accumulator Interrupt Enable and Overflow Flag
PAII and PAIF — Pulse Accumulator Input Edge Interrupt Enable Bit and Flag
The PAOVF status bit is set each time the pulse accumulator count rolls over
from $FF to $00. To clear this status bit, write a 1 in the corresponding data bit
position (bit 5) of the TFLG2 register. The PAOVI control bit allows configuring
the pulse accumulator overflow for polled or interrupt-driven operation and does
not affect the state of PAOVF. When PAOVI is 0, pulse accumulator overflow
interrupts are inhibited, and the system operates in a polled mode, which
requires that PAOVF be polled by user software to determine when an overflow
has occurred. When the PAOVI control bit is set, a hardware interrupt request
is generated each time PAOVF is set. Before leaving the interrupt service
routine, software must clear PAOVF by writing to the TFLG2 register.
The PAIF status bit is automatically set each time a selected edge is detected
at the PA7/PAI/OC1 pin. To clear this status bit, write to the TFLG2 register with
a 1 in the corresponding data bit position (bit 4). The PAII control bit allows
configuring the pulse accumulator input edge detect for polled or
interrupt-driven operation but does not affect setting or clearing the PAIF bit.
When PAII is 0, pulse accumulator input interrupts are inhibited, and the system
operates in a polled mode. In this mode, the PAIF bit must be polled by user
software to determine when an edge has occurred. When the PAII control bit is
set, a hardware interrupt request is generated each time PAIF is set. Before
leaving the interrupt service routine, software must clear PAIF by writing to the
TFLG2 register.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Timing System
Pulse Accumulator
Timing System
Data Sheet
163
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