mc68hc11d0 Freescale Semiconductor, Inc, mc68hc11d0 Datasheet - Page 89

• Manufacturer Part Number: mc68hc11d0
• Description: Mc68hc11d0 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

9.1 Timer Structure
TECHNICAL DATA
Figure 9-1 shows the capture/compare system block diagram. The port A pin control
block includes logic for timer functions and for general-purpose I/O. For pins PA2,
PA1, and PA0, this block contains both the edge-detection logic and the control logic
that enables the selection of which edge triggers an input capture. The digital level on
PA[2:0] can be read at any time (read PORTA register), even if the pin is being used
for the input capture function. Pins PA[6:4] are used for either general-purpose output,
or as output compare pins. Pin PA3 can be used for general-purpose I/O, input capture
4, output compare 5, or output compare 1. When one of these pins is being used for
an output compare function, it cannot be written directly as if it were a general-purpose
output. Each of the output compare functions (OC5–OC2) is related to one of the port
A output pins. Output compare one (OC1) has extra control logic, allowing it optional
control of any combination of the PA[7:3] pins. The PA7 pin can be used as a general-
purpose I/O pin, as an input to the pulse accumulator, or as an OC1 output pin.
overflow —
overflow —
overflow —
overflow —
1 count —
1 count —
1 count —
1 count —
Control
PR[1:0]
Bits
0 0
0 1
1 0
1 1
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65.536 ms
262.14 ms
524.29 ms
4.0 MHz
1.0 MHz
1000 ns
16.0 µs
1.049 s
1.0 µs
4.0 µs
8.0 µs
Table 9-1 Timer Summary
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TIMING SYSTEM
XTAL Frequencies
32.768 ms
131.07 ms
262.14 ms
524.29 ms
8.0 MHz
2.0 MHz
500 ns
Main Timer Count Rates
500 ns
2.0 µs
4.0 µs
8.0 µs
21.845 ms
87.381 ms
174.76 ms
349.52 ms
12.0 MHz
1.333 µs
2.667 µs
5.333 µs
3.0 MHz
333 ns
333 ns
Other Rates
(E/2
(E/2
(E/2
(E/2
(E/16)
(1/E)
(E/1)
(E/4)
(E/8)
(E)
16
18
19
20
)
)
)
)
9-3