M68HC11K Datasheet, PDF (197/290 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Timing System
Output Compare (OC)
• After a match occurs, change the appropriate OC1D bit to the
opposite polarity, then add a value representing the width of the
pulse to the original value and write it to the output compare
register.
Because the pin state changes occur at specific values of the
free-running counter, the pulse width can be controlled accurately to the
resolution of the free-running counter, independent of software
latencies. To generate an output signal of a specific frequency and duty
cycle, repeat this pulse-generating procedure.
9.6.1 Timer Output Compare Registers
Bit 7
6
5
4
3
2
1
Bit 0
Address: $0016 — TOC1 (High)
Read:
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9
Bit 8
Write:
Reset: 1
1
1
1
1
1
1
1
Address: $0017 — TOC1 (Low)
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset: 1
1
1
1
1
1
1
1
Address: $0018 — TOC2 (High)
Read:
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9
Bit 8
Write:
Reset: 1
1
1
1
1
1
1
1
Address: $0019 — TOC2 (Low)
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset: 1
1
1
1
1
1
1
1
Figure 9-13. Timer Output Compare
Registers (TOC1–TOC4)
M68HC11K Family
MOTOROLA
Timing System
For More Information On This Product,
Go to: www.freescale.com
Technical Data
197