mc68hc11f1cpu3 Freescale Semiconductor, Inc, mc68hc11f1cpu3 Datasheet - Page 109

• Manufacturer Part Number: mc68hc11f1cpu3
• Description: Mc68hc11f1 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

9.1 Timer Structure
TECHNICAL DATA
Figure 9-2 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 PA3,
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 lev-
el on PA[3:0] can be read at any time (read PORTA register), even if the pin is being
used for the input capture function. Pins PA[6:3] are used for either general-purpose
I/O, or as output compare pins. 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 (OC[5:2]) 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.
Control Bits
overflow —
overflow —
overflow —
overflow —
1 count —
1 count —
1 count —
1 count —
PR1, PR0
0 0
0 1
1 0
1 1
65.536 ms
262.14 ms
524.29 ms
4.0 MHz
1.0 MHz
1000 ns
16.0 s
1.049 s
1.0 s
4.0 s
8.0 s
Freescale Semiconductor, Inc.
For More Information On This Product,
Table 9-1 Timer Summary
Go to: www.freescale.com
32.768 ms
131.07 ms
262.14 ms
524.29 ms
8.0 MHz
2.0 MHz
500 ns
500 ns
2.0 s
4.0 s
8.0 s
XTAL Frequencies
TIMING SYSTEM
Main Timer Count Rates
87.381 ms
174.76 ms
21.845 ms
349.52 ms
12.0 MHz
1.333 s
2.667 s
5.333 s
3.0 MHz
333 ns
333 ns
16.384 ms
65.536 ms
131.07 ms
262.14 ms
16.0 MHz
4.0 MHz
250 ns
250 ns
1.0 s
2.0 s
4.0 s
Other Rates
(2
(2
(2
(2
(16/E)
(1/E)
(1/E)
(4/E)
(8/E)
16
18
19
20
(E)
/E)
/E)
/E)
/E)
9-3