參數(shù)資料
型號(hào)： MC68HC705X4
廠商： Motorola, Inc.
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 119/156頁
文件大?。?/td> 926K
代理商： MC68HC705X4
16-Bit Programmable Timer
Timer functions
MC68HC05X4 Rev 1.0
MOTOROLA
16-Bit Programmable Timer
For More Information On This Product,
Go to: www.freescale.com
119
11-ptimer
Output compare
function
‘Output compare’ is a technique that may be used, for example, to
generate an output waveform, or to signal when a specific time period
has elapsed, by presetting the output compare register to the
appropriate value.
Output compare
registers
The 16-bit output compare register is made up of two 8-bit registers at
locations $16 (MSB) and $17 (LSB). The contents of the output compare
register are continually compared with the contents of the free-running
counter and, if a match is found, the output compare flag (OCF) in the
timer status register is set and the output level (OLVL) bit clocked to the
output level register. The output compare register values and the output
level bit should be changed after each successful comparison to
establish a new elapsed timeout. An interrupt can also accompany a
successful output compare provided the corresponding interrupt enable
bit (OCIE) is set. (The free-running counter is updated every four internal
bus clock cycles.)
After a processor write cycle to the output compare register containing
the MSB at location $16, the output compare function is inhibited until
the LSB at location $17 is also written. The user must write both bytes
(locations) if the MSB is written first. A write made only to the LSB at
Address:
$0016
Bit 15
14
13
12
11
10
9
Bit 8
Reset:
Undefined
Figure 10. Output Compare High Register (OCH)
Address:
$0017
Bit 7
6
5
4
3
2
1
Bit 0
Reset:
Undefined
Figure 11. Output Compare Low Register (OCL)
F
Freescale Semiconductor, Inc.
n
.
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